diff --git a/packages/racing/application/ports/ILiveryCompositor.ts b/packages/racing/application/ports/ILiveryCompositor.ts
new file mode 100644
index 000000000..d970c7e5f
--- /dev/null
+++ b/packages/racing/application/ports/ILiveryCompositor.ts
@@ -0,0 +1,46 @@
+/**
+ * Application Port: ILiveryCompositor
+ * 
+ * Defines interface for livery image composition.
+ * Infrastructure will provide image processing implementation.
+ */
+
+import type { LiveryDecal } from '../../domain/value-objects/LiveryDecal';
+
+export interface CompositionResult {
+  success: boolean;
+  composedImageUrl?: string;
+  error?: string;
+  timestamp: Date;
+}
+
+export interface ILiveryCompositor {
+  /**
+   * Composite a livery by layering decals on base image
+   */
+  composeLivery(
+    baseImageUrl: string,
+    decals: LiveryDecal[]
+  ): Promise<CompositionResult>;
+
+  /**
+   * Generate a livery pack (.zip) for all drivers in a season
+   */
+  generateLiveryPack(
+    seasonId: string,
+    liveryData: Array<{
+      driverId: string;
+      driverName: string;
+      carId: string;
+      composedImageUrl: string;
+    }>
+  ): Promise<Buffer>;
+
+  /**
+   * Validate livery image (check for logos/text)
+   */
+  validateLiveryImage(imageUrl: string): Promise<{
+    isValid: boolean;
+    violations?: string[];
+  }>;
+}
\ No newline at end of file
diff --git a/packages/racing/application/ports/ILiveryStorage.ts b/packages/racing/application/ports/ILiveryStorage.ts
new file mode 100644
index 000000000..1e1c82c8d
--- /dev/null
+++ b/packages/racing/application/ports/ILiveryStorage.ts
@@ -0,0 +1,39 @@
+/**
+ * Application Port: ILiveryStorage
+ * 
+ * Defines interface for livery image storage.
+ * Infrastructure will provide cloud storage adapter.
+ */
+
+export interface UploadResult {
+  success: boolean;
+  imageUrl?: string;
+  error?: string;
+  timestamp: Date;
+}
+
+export interface ILiveryStorage {
+  /**
+   * Upload a livery image
+   */
+  upload(
+    imageData: Buffer | string,
+    fileName: string,
+    metadata?: Record<string, unknown>
+  ): Promise<UploadResult>;
+
+  /**
+   * Download a livery image
+   */
+  download(imageUrl: string): Promise<Buffer>;
+
+  /**
+   * Delete a livery image
+   */
+  delete(imageUrl: string): Promise<void>;
+
+  /**
+   * Generate a signed URL for temporary access
+   */
+  generateSignedUrl(imageUrl: string, expiresInSeconds: number): Promise<string>;
+}
\ No newline at end of file
diff --git a/packages/racing/application/ports/IPaymentGateway.ts b/packages/racing/application/ports/IPaymentGateway.ts
new file mode 100644
index 000000000..7524dc47d
--- /dev/null
+++ b/packages/racing/application/ports/IPaymentGateway.ts
@@ -0,0 +1,48 @@
+/**
+ * Application Port: IPaymentGateway
+ * 
+ * Defines interface for payment processing.
+ * Infrastructure will provide mock or real implementation.
+ */
+
+import type { Money } from '../../domain/value-objects/Money';
+
+export interface PaymentResult {
+  success: boolean;
+  transactionId?: string;
+  error?: string;
+  timestamp: Date;
+}
+
+export interface RefundResult {
+  success: boolean;
+  refundId?: string;
+  error?: string;
+  timestamp: Date;
+}
+
+export interface IPaymentGateway {
+  /**
+   * Process a payment
+   */
+  processPayment(
+    amount: Money,
+    payerId: string,
+    description: string,
+    metadata?: Record<string, unknown>
+  ): Promise<PaymentResult>;
+
+  /**
+   * Refund a payment
+   */
+  refund(
+    originalTransactionId: string,
+    amount: Money,
+    reason: string
+  ): Promise<RefundResult>;
+
+  /**
+   * Verify payment status
+   */
+  verifyPayment(transactionId: string): Promise<PaymentResult>;
+}
\ No newline at end of file
diff --git a/packages/racing/domain/entities/DriverLivery.ts b/packages/racing/domain/entities/DriverLivery.ts
new file mode 100644
index 000000000..e2c79c332
--- /dev/null
+++ b/packages/racing/domain/entities/DriverLivery.ts
@@ -0,0 +1,203 @@
+/**
+ * Domain Entity: DriverLivery
+ * 
+ * Represents a driver's custom livery for a specific car.
+ * Includes user-placed decals and league-specific overrides.
+ */
+
+import type { LiveryDecal } from '../value-objects/LiveryDecal';
+
+export interface DecalOverride {
+  leagueId: string;
+  seasonId: string;
+  decalId: string;
+  newX: number;
+  newY: number;
+}
+
+export interface DriverLiveryProps {
+  id: string;
+  driverId: string;
+  carId: string;
+  uploadedImageUrl: string;
+  userDecals: LiveryDecal[];
+  leagueOverrides: DecalOverride[];
+  createdAt: Date;
+  updatedAt?: Date;
+  validatedAt?: Date;
+}
+
+export class DriverLivery {
+  readonly id: string;
+  readonly driverId: string;
+  readonly carId: string;
+  readonly uploadedImageUrl: string;
+  readonly userDecals: LiveryDecal[];
+  readonly leagueOverrides: DecalOverride[];
+  readonly createdAt: Date;
+  readonly updatedAt?: Date;
+  readonly validatedAt?: Date;
+
+  private constructor(props: DriverLiveryProps) {
+    this.id = props.id;
+    this.driverId = props.driverId;
+    this.carId = props.carId;
+    this.uploadedImageUrl = props.uploadedImageUrl;
+    this.userDecals = props.userDecals;
+    this.leagueOverrides = props.leagueOverrides;
+    this.createdAt = props.createdAt;
+    this.updatedAt = props.updatedAt;
+    this.validatedAt = props.validatedAt;
+  }
+
+  static create(props: Omit<DriverLiveryProps, 'createdAt' | 'userDecals' | 'leagueOverrides'> & {
+    createdAt?: Date;
+    userDecals?: LiveryDecal[];
+    leagueOverrides?: DecalOverride[];
+  }): DriverLivery {
+    this.validate(props);
+
+    return new DriverLivery({
+      ...props,
+      createdAt: props.createdAt ?? new Date(),
+      userDecals: props.userDecals ?? [],
+      leagueOverrides: props.leagueOverrides ?? [],
+    });
+  }
+
+  private static validate(props: Omit<DriverLiveryProps, 'createdAt' | 'userDecals' | 'leagueOverrides'>): void {
+    if (!props.id || props.id.trim().length === 0) {
+      throw new Error('DriverLivery ID is required');
+    }
+
+    if (!props.driverId || props.driverId.trim().length === 0) {
+      throw new Error('DriverLivery driverId is required');
+    }
+
+    if (!props.carId || props.carId.trim().length === 0) {
+      throw new Error('DriverLivery carId is required');
+    }
+
+    if (!props.uploadedImageUrl || props.uploadedImageUrl.trim().length === 0) {
+      throw new Error('DriverLivery uploadedImageUrl is required');
+    }
+  }
+
+  /**
+   * Add a user decal
+   */
+  addDecal(decal: LiveryDecal): DriverLivery {
+    if (decal.type !== 'user') {
+      throw new Error('Only user decals can be added to driver livery');
+    }
+
+    return new DriverLivery({
+      ...this,
+      userDecals: [...this.userDecals, decal],
+      updatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Remove a user decal
+   */
+  removeDecal(decalId: string): DriverLivery {
+    const updatedDecals = this.userDecals.filter(d => d.id !== decalId);
+
+    if (updatedDecals.length === this.userDecals.length) {
+      throw new Error('Decal not found in livery');
+    }
+
+    return new DriverLivery({
+      ...this,
+      userDecals: updatedDecals,
+      updatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Update a user decal
+   */
+  updateDecal(decalId: string, updatedDecal: LiveryDecal): DriverLivery {
+    const index = this.userDecals.findIndex(d => d.id === decalId);
+
+    if (index === -1) {
+      throw new Error('Decal not found in livery');
+    }
+
+    const updatedDecals = [...this.userDecals];
+    updatedDecals[index] = updatedDecal;
+
+    return new DriverLivery({
+      ...this,
+      userDecals: updatedDecals,
+      updatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Add or update a league-specific decal override
+   */
+  setLeagueOverride(leagueId: string, seasonId: string, decalId: string, newX: number, newY: number): DriverLivery {
+    const existingIndex = this.leagueOverrides.findIndex(
+      o => o.leagueId === leagueId && o.seasonId === seasonId && o.decalId === decalId
+    );
+
+    const override: DecalOverride = { leagueId, seasonId, decalId, newX, newY };
+    
+    let updatedOverrides: DecalOverride[];
+    if (existingIndex >= 0) {
+      updatedOverrides = [...this.leagueOverrides];
+      updatedOverrides[existingIndex] = override;
+    } else {
+      updatedOverrides = [...this.leagueOverrides, override];
+    }
+
+    return new DriverLivery({
+      ...this,
+      leagueOverrides: updatedOverrides,
+      updatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Remove a league-specific override
+   */
+  removeLeagueOverride(leagueId: string, seasonId: string, decalId: string): DriverLivery {
+    const updatedOverrides = this.leagueOverrides.filter(
+      o => !(o.leagueId === leagueId && o.seasonId === seasonId && o.decalId === decalId)
+    );
+
+    return new DriverLivery({
+      ...this,
+      leagueOverrides: updatedOverrides,
+      updatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Get overrides for a specific league/season
+   */
+  getOverridesFor(leagueId: string, seasonId: string): DecalOverride[] {
+    return this.leagueOverrides.filter(
+      o => o.leagueId === leagueId && o.seasonId === seasonId
+    );
+  }
+
+  /**
+   * Mark livery as validated (no logos/text detected)
+   */
+  markAsValidated(): DriverLivery {
+    return new DriverLivery({
+      ...this,
+      validatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Check if livery is validated
+   */
+  isValidated(): boolean {
+    return this.validatedAt !== undefined;
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/domain/entities/LeagueWallet.ts b/packages/racing/domain/entities/LeagueWallet.ts
new file mode 100644
index 000000000..901d560c4
--- /dev/null
+++ b/packages/racing/domain/entities/LeagueWallet.ts
@@ -0,0 +1,123 @@
+/**
+ * Domain Entity: LeagueWallet
+ * 
+ * Represents a league's financial wallet.
+ * Aggregate root for managing league finances and transactions.
+ */
+
+import type { Money } from '../value-objects/Money';
+import type { Transaction } from './Transaction';
+
+export interface LeagueWalletProps {
+  id: string;
+  leagueId: string;
+  balance: Money;
+  transactionIds: string[];
+  createdAt: Date;
+}
+
+export class LeagueWallet {
+  readonly id: string;
+  readonly leagueId: string;
+  readonly balance: Money;
+  readonly transactionIds: string[];
+  readonly createdAt: Date;
+
+  private constructor(props: LeagueWalletProps) {
+    this.id = props.id;
+    this.leagueId = props.leagueId;
+    this.balance = props.balance;
+    this.transactionIds = props.transactionIds;
+    this.createdAt = props.createdAt;
+  }
+
+  static create(props: Omit<LeagueWalletProps, 'createdAt' | 'transactionIds'> & {
+    createdAt?: Date;
+    transactionIds?: string[];
+  }): LeagueWallet {
+    this.validate(props);
+
+    return new LeagueWallet({
+      ...props,
+      createdAt: props.createdAt ?? new Date(),
+      transactionIds: props.transactionIds ?? [],
+    });
+  }
+
+  private static validate(props: Omit<LeagueWalletProps, 'createdAt' | 'transactionIds'>): void {
+    if (!props.id || props.id.trim().length === 0) {
+      throw new Error('LeagueWallet ID is required');
+    }
+
+    if (!props.leagueId || props.leagueId.trim().length === 0) {
+      throw new Error('LeagueWallet leagueId is required');
+    }
+
+    if (!props.balance) {
+      throw new Error('LeagueWallet balance is required');
+    }
+  }
+
+  /**
+   * Add funds to wallet (from sponsorship or membership payments)
+   */
+  addFunds(netAmount: Money, transactionId: string): LeagueWallet {
+    if (this.balance.currency !== netAmount.currency) {
+      throw new Error('Cannot add funds with different currency');
+    }
+
+    const newBalance = this.balance.add(netAmount);
+
+    return new LeagueWallet({
+      ...this,
+      balance: newBalance,
+      transactionIds: [...this.transactionIds, transactionId],
+    });
+  }
+
+  /**
+   * Withdraw funds from wallet
+   * Domain rule: Cannot withdraw if insufficient balance
+   */
+  withdrawFunds(amount: Money, transactionId: string): LeagueWallet {
+    if (this.balance.currency !== amount.currency) {
+      throw new Error('Cannot withdraw funds with different currency');
+    }
+
+    if (!this.balance.isGreaterThan(amount) && !this.balance.equals(amount)) {
+      throw new Error('Insufficient balance for withdrawal');
+    }
+
+    const newBalance = this.balance.subtract(amount);
+
+    return new LeagueWallet({
+      ...this,
+      balance: newBalance,
+      transactionIds: [...this.transactionIds, transactionId],
+    });
+  }
+
+  /**
+   * Check if wallet can withdraw a specific amount
+   */
+  canWithdraw(amount: Money): boolean {
+    if (this.balance.currency !== amount.currency) {
+      return false;
+    }
+    return this.balance.isGreaterThan(amount) || this.balance.equals(amount);
+  }
+
+  /**
+   * Get current balance
+   */
+  getBalance(): Money {
+    return this.balance;
+  }
+
+  /**
+   * Get all transaction IDs
+   */
+  getTransactionIds(): string[] {
+    return [...this.transactionIds];
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/domain/entities/LiveryTemplate.ts b/packages/racing/domain/entities/LiveryTemplate.ts
new file mode 100644
index 000000000..d601ffbd7
--- /dev/null
+++ b/packages/racing/domain/entities/LiveryTemplate.ts
@@ -0,0 +1,142 @@
+/**
+ * Domain Entity: LiveryTemplate
+ * 
+ * Represents an admin-defined livery template for a specific car.
+ * Contains base image and sponsor decal placements.
+ */
+
+import type { LiveryDecal } from '../value-objects/LiveryDecal';
+
+export interface LiveryTemplateProps {
+  id: string;
+  leagueId: string;
+  seasonId: string;
+  carId: string;
+  baseImageUrl: string;
+  adminDecals: LiveryDecal[];
+  createdAt: Date;
+  updatedAt?: Date;
+}
+
+export class LiveryTemplate {
+  readonly id: string;
+  readonly leagueId: string;
+  readonly seasonId: string;
+  readonly carId: string;
+  readonly baseImageUrl: string;
+  readonly adminDecals: LiveryDecal[];
+  readonly createdAt: Date;
+  readonly updatedAt?: Date;
+
+  private constructor(props: LiveryTemplateProps) {
+    this.id = props.id;
+    this.leagueId = props.leagueId;
+    this.seasonId = props.seasonId;
+    this.carId = props.carId;
+    this.baseImageUrl = props.baseImageUrl;
+    this.adminDecals = props.adminDecals;
+    this.createdAt = props.createdAt;
+    this.updatedAt = props.updatedAt;
+  }
+
+  static create(props: Omit<LiveryTemplateProps, 'createdAt' | 'adminDecals'> & {
+    createdAt?: Date;
+    adminDecals?: LiveryDecal[];
+  }): LiveryTemplate {
+    this.validate(props);
+
+    return new LiveryTemplate({
+      ...props,
+      createdAt: props.createdAt ?? new Date(),
+      adminDecals: props.adminDecals ?? [],
+    });
+  }
+
+  private static validate(props: Omit<LiveryTemplateProps, 'createdAt' | 'adminDecals'>): void {
+    if (!props.id || props.id.trim().length === 0) {
+      throw new Error('LiveryTemplate ID is required');
+    }
+
+    if (!props.leagueId || props.leagueId.trim().length === 0) {
+      throw new Error('LiveryTemplate leagueId is required');
+    }
+
+    if (!props.seasonId || props.seasonId.trim().length === 0) {
+      throw new Error('LiveryTemplate seasonId is required');
+    }
+
+    if (!props.carId || props.carId.trim().length === 0) {
+      throw new Error('LiveryTemplate carId is required');
+    }
+
+    if (!props.baseImageUrl || props.baseImageUrl.trim().length === 0) {
+      throw new Error('LiveryTemplate baseImageUrl is required');
+    }
+  }
+
+  /**
+   * Add a decal to the template
+   */
+  addDecal(decal: LiveryDecal): LiveryTemplate {
+    if (decal.type !== 'sponsor') {
+      throw new Error('Only sponsor decals can be added to admin template');
+    }
+
+    return new LiveryTemplate({
+      ...this,
+      adminDecals: [...this.adminDecals, decal],
+      updatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Remove a decal from the template
+   */
+  removeDecal(decalId: string): LiveryTemplate {
+    const updatedDecals = this.adminDecals.filter(d => d.id !== decalId);
+
+    if (updatedDecals.length === this.adminDecals.length) {
+      throw new Error('Decal not found in template');
+    }
+
+    return new LiveryTemplate({
+      ...this,
+      adminDecals: updatedDecals,
+      updatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Update a decal position
+   */
+  updateDecal(decalId: string, updatedDecal: LiveryDecal): LiveryTemplate {
+    const index = this.adminDecals.findIndex(d => d.id === decalId);
+
+    if (index === -1) {
+      throw new Error('Decal not found in template');
+    }
+
+    const updatedDecals = [...this.adminDecals];
+    updatedDecals[index] = updatedDecal;
+
+    return new LiveryTemplate({
+      ...this,
+      adminDecals: updatedDecals,
+      updatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Get all sponsor decals
+   */
+  getSponsorDecals(): LiveryDecal[] {
+    return this.adminDecals.filter(d => d.type === 'sponsor');
+  }
+
+  /**
+   * Check if template has sponsor decals
+   */
+  hasSponsorDecals(): boolean {
+    return this.adminDecals.some(d => d.type === 'sponsor');
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/domain/entities/Prize.ts b/packages/racing/domain/entities/Prize.ts
new file mode 100644
index 000000000..01a6aca33
--- /dev/null
+++ b/packages/racing/domain/entities/Prize.ts
@@ -0,0 +1,157 @@
+/**
+ * Domain Entity: Prize
+ * 
+ * Represents a prize awarded to a driver for a specific position in a season.
+ */
+
+import type { Money } from '../value-objects/Money';
+
+export type PrizeStatus = 'pending' | 'awarded' | 'paid' | 'cancelled';
+
+export interface PrizeProps {
+  id: string;
+  seasonId: string;
+  position: number;
+  amount: Money;
+  driverId?: string;
+  status: PrizeStatus;
+  createdAt: Date;
+  awardedAt?: Date;
+  paidAt?: Date;
+  description?: string;
+}
+
+export class Prize {
+  readonly id: string;
+  readonly seasonId: string;
+  readonly position: number;
+  readonly amount: Money;
+  readonly driverId?: string;
+  readonly status: PrizeStatus;
+  readonly createdAt: Date;
+  readonly awardedAt?: Date;
+  readonly paidAt?: Date;
+  readonly description?: string;
+
+  private constructor(props: PrizeProps) {
+    this.id = props.id;
+    this.seasonId = props.seasonId;
+    this.position = props.position;
+    this.amount = props.amount;
+    this.driverId = props.driverId;
+    this.status = props.status;
+    this.createdAt = props.createdAt;
+    this.awardedAt = props.awardedAt;
+    this.paidAt = props.paidAt;
+    this.description = props.description;
+  }
+
+  static create(props: Omit<PrizeProps, 'createdAt' | 'status'> & {
+    createdAt?: Date;
+    status?: PrizeStatus;
+  }): Prize {
+    this.validate(props);
+
+    return new Prize({
+      ...props,
+      createdAt: props.createdAt ?? new Date(),
+      status: props.status ?? 'pending',
+    });
+  }
+
+  private static validate(props: Omit<PrizeProps, 'createdAt' | 'status'>): void {
+    if (!props.id || props.id.trim().length === 0) {
+      throw new Error('Prize ID is required');
+    }
+
+    if (!props.seasonId || props.seasonId.trim().length === 0) {
+      throw new Error('Prize seasonId is required');
+    }
+
+    if (!Number.isInteger(props.position) || props.position < 1) {
+      throw new Error('Prize position must be a positive integer');
+    }
+
+    if (!props.amount) {
+      throw new Error('Prize amount is required');
+    }
+
+    if (props.amount.amount <= 0) {
+      throw new Error('Prize amount must be greater than zero');
+    }
+  }
+
+  /**
+   * Award prize to a driver
+   */
+  awardTo(driverId: string): Prize {
+    if (!driverId || driverId.trim().length === 0) {
+      throw new Error('Driver ID is required to award prize');
+    }
+
+    if (this.status !== 'pending') {
+      throw new Error('Only pending prizes can be awarded');
+    }
+
+    return new Prize({
+      ...this,
+      driverId,
+      status: 'awarded',
+      awardedAt: new Date(),
+    });
+  }
+
+  /**
+   * Mark prize as paid
+   */
+  markAsPaid(): Prize {
+    if (this.status !== 'awarded') {
+      throw new Error('Only awarded prizes can be marked as paid');
+    }
+
+    if (!this.driverId) {
+      throw new Error('Prize must have a driver to be paid');
+    }
+
+    return new Prize({
+      ...this,
+      status: 'paid',
+      paidAt: new Date(),
+    });
+  }
+
+  /**
+   * Cancel prize
+   */
+  cancel(): Prize {
+    if (this.status === 'paid') {
+      throw new Error('Cannot cancel a paid prize');
+    }
+
+    return new Prize({
+      ...this,
+      status: 'cancelled',
+    });
+  }
+
+  /**
+   * Check if prize is pending
+   */
+  isPending(): boolean {
+    return this.status === 'pending';
+  }
+
+  /**
+   * Check if prize is awarded
+   */
+  isAwarded(): boolean {
+    return this.status === 'awarded';
+  }
+
+  /**
+   * Check if prize is paid
+   */
+  isPaid(): boolean {
+    return this.status === 'paid';
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/domain/entities/Season.ts b/packages/racing/domain/entities/Season.ts
index 4de3c53f9..97fe9bd65 100644
--- a/packages/racing/domain/entities/Season.ts
+++ b/packages/racing/domain/entities/Season.ts
@@ -74,4 +74,25 @@ export class Season {
       endDate: props.endDate,
     });
   }
+
+  /**
+   * Domain rule: Wallet withdrawals are only allowed when season is completed
+   */
+  canWithdrawFromWallet(): boolean {
+    return this.status === 'completed';
+  }
+
+  /**
+   * Check if season is active
+   */
+  isActive(): boolean {
+    return this.status === 'active';
+  }
+
+  /**
+   * Check if season is completed
+   */
+  isCompleted(): boolean {
+    return this.status === 'completed';
+  }
 }
\ No newline at end of file
diff --git a/packages/racing/domain/entities/SeasonSponsorship.ts b/packages/racing/domain/entities/SeasonSponsorship.ts
new file mode 100644
index 000000000..35f3c4e5b
--- /dev/null
+++ b/packages/racing/domain/entities/SeasonSponsorship.ts
@@ -0,0 +1,140 @@
+/**
+ * Domain Entity: SeasonSponsorship
+ * 
+ * Represents a sponsorship relationship between a Sponsor and a Season.
+ * Aggregate root for managing sponsorship slots and pricing.
+ */
+
+import type { Money } from '../value-objects/Money';
+
+export type SponsorshipTier = 'main' | 'secondary';
+export type SponsorshipStatus = 'pending' | 'active' | 'cancelled';
+
+export interface SeasonSponsorshipProps {
+  id: string;
+  seasonId: string;
+  sponsorId: string;
+  tier: SponsorshipTier;
+  pricing: Money;
+  status: SponsorshipStatus;
+  createdAt: Date;
+  activatedAt?: Date;
+  description?: string;
+}
+
+export class SeasonSponsorship {
+  readonly id: string;
+  readonly seasonId: string;
+  readonly sponsorId: string;
+  readonly tier: SponsorshipTier;
+  readonly pricing: Money;
+  readonly status: SponsorshipStatus;
+  readonly createdAt: Date;
+  readonly activatedAt?: Date;
+  readonly description?: string;
+
+  private constructor(props: SeasonSponsorshipProps) {
+    this.id = props.id;
+    this.seasonId = props.seasonId;
+    this.sponsorId = props.sponsorId;
+    this.tier = props.tier;
+    this.pricing = props.pricing;
+    this.status = props.status;
+    this.createdAt = props.createdAt;
+    this.activatedAt = props.activatedAt;
+    this.description = props.description;
+  }
+
+  static create(props: Omit<SeasonSponsorshipProps, 'createdAt' | 'status'> & { 
+    createdAt?: Date;
+    status?: SponsorshipStatus;
+  }): SeasonSponsorship {
+    this.validate(props);
+
+    return new SeasonSponsorship({
+      ...props,
+      createdAt: props.createdAt ?? new Date(),
+      status: props.status ?? 'pending',
+    });
+  }
+
+  private static validate(props: Omit<SeasonSponsorshipProps, 'createdAt' | 'status'>): void {
+    if (!props.id || props.id.trim().length === 0) {
+      throw new Error('SeasonSponsorship ID is required');
+    }
+
+    if (!props.seasonId || props.seasonId.trim().length === 0) {
+      throw new Error('SeasonSponsorship seasonId is required');
+    }
+
+    if (!props.sponsorId || props.sponsorId.trim().length === 0) {
+      throw new Error('SeasonSponsorship sponsorId is required');
+    }
+
+    if (!props.tier) {
+      throw new Error('SeasonSponsorship tier is required');
+    }
+
+    if (!props.pricing) {
+      throw new Error('SeasonSponsorship pricing is required');
+    }
+
+    if (props.pricing.amount <= 0) {
+      throw new Error('SeasonSponsorship pricing must be greater than zero');
+    }
+  }
+
+  /**
+   * Activate the sponsorship
+   */
+  activate(): SeasonSponsorship {
+    if (this.status === 'active') {
+      throw new Error('SeasonSponsorship is already active');
+    }
+
+    if (this.status === 'cancelled') {
+      throw new Error('Cannot activate a cancelled SeasonSponsorship');
+    }
+
+    return new SeasonSponsorship({
+      ...this,
+      status: 'active',
+      activatedAt: new Date(),
+    });
+  }
+
+  /**
+   * Cancel the sponsorship
+   */
+  cancel(): SeasonSponsorship {
+    if (this.status === 'cancelled') {
+      throw new Error('SeasonSponsorship is already cancelled');
+    }
+
+    return new SeasonSponsorship({
+      ...this,
+      status: 'cancelled',
+    });
+  }
+
+  /**
+   * Check if sponsorship is active
+   */
+  isActive(): boolean {
+    return this.status === 'active';
+  }
+
+  /**
+   * Get the platform fee for this sponsorship
+   */
+  getPlatformFee(): Money {
+    return this.pricing.calculatePlatformFee();
+  }
+
+  /**
+   * Get the net amount after platform fee
+   */
+  getNetAmount(): Money {
+    return this.pricing.calculateNetAmount();
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/domain/entities/Sponsor.ts b/packages/racing/domain/entities/Sponsor.ts
new file mode 100644
index 000000000..1852e8ce1
--- /dev/null
+++ b/packages/racing/domain/entities/Sponsor.ts
@@ -0,0 +1,96 @@
+/**
+ * Domain Entity: Sponsor
+ * 
+ * Represents a sponsor that can sponsor leagues/seasons.
+ * Aggregate root for sponsor information.
+ */
+
+export interface SponsorProps {
+  id: string;
+  name: string;
+  contactEmail: string;
+  logoUrl?: string;
+  websiteUrl?: string;
+  createdAt: Date;
+}
+
+export class Sponsor {
+  readonly id: string;
+  readonly name: string;
+  readonly contactEmail: string;
+  readonly logoUrl?: string;
+  readonly websiteUrl?: string;
+  readonly createdAt: Date;
+
+  private constructor(props: SponsorProps) {
+    this.id = props.id;
+    this.name = props.name;
+    this.contactEmail = props.contactEmail;
+    this.logoUrl = props.logoUrl;
+    this.websiteUrl = props.websiteUrl;
+    this.createdAt = props.createdAt;
+  }
+
+  static create(props: Omit<SponsorProps, 'createdAt'> & { createdAt?: Date }): Sponsor {
+    this.validate(props);
+    
+    return new Sponsor({
+      ...props,
+      createdAt: props.createdAt ?? new Date(),
+    });
+  }
+
+  private static validate(props: Omit<SponsorProps, 'createdAt'>): void {
+    if (!props.id || props.id.trim().length === 0) {
+      throw new Error('Sponsor ID is required');
+    }
+
+    if (!props.name || props.name.trim().length === 0) {
+      throw new Error('Sponsor name is required');
+    }
+
+    if (props.name.length > 100) {
+      throw new Error('Sponsor name must be 100 characters or less');
+    }
+
+    if (!props.contactEmail || props.contactEmail.trim().length === 0) {
+      throw new Error('Sponsor contact email is required');
+    }
+
+    // Basic email validation
+    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+    if (!emailRegex.test(props.contactEmail)) {
+      throw new Error('Invalid sponsor contact email format');
+    }
+
+    if (props.websiteUrl && props.websiteUrl.trim().length > 0) {
+      try {
+        new URL(props.websiteUrl);
+      } catch {
+        throw new Error('Invalid sponsor website URL');
+      }
+    }
+  }
+
+  /**
+   * Update sponsor information
+   */
+  update(props: Partial<{
+    name: string;
+    contactEmail: string;
+    logoUrl: string | undefined;
+    websiteUrl: string | undefined;
+  }>): Sponsor {
+    const updated = {
+      id: this.id,
+      name: props.name ?? this.name,
+      contactEmail: props.contactEmail ?? this.contactEmail,
+      logoUrl: props.logoUrl !== undefined ? props.logoUrl : this.logoUrl,
+      websiteUrl: props.websiteUrl !== undefined ? props.websiteUrl : this.websiteUrl,
+      createdAt: this.createdAt,
+    };
+
+    Sponsor.validate(updated);
+    return new Sponsor(updated);
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/domain/entities/Transaction.ts b/packages/racing/domain/entities/Transaction.ts
new file mode 100644
index 000000000..0abc14e2d
--- /dev/null
+++ b/packages/racing/domain/entities/Transaction.ts
@@ -0,0 +1,159 @@
+/**
+ * Domain Entity: Transaction
+ * 
+ * Represents a financial transaction in the league wallet system.
+ */
+
+import type { Money } from '../value-objects/Money';
+
+export type TransactionType = 
+  | 'sponsorship_payment'
+  | 'membership_payment'
+  | 'prize_payout'
+  | 'withdrawal'
+  | 'refund';
+
+export type TransactionStatus = 'pending' | 'completed' | 'failed' | 'cancelled';
+
+export interface TransactionProps {
+  id: string;
+  walletId: string;
+  type: TransactionType;
+  amount: Money;
+  platformFee: Money;
+  netAmount: Money;
+  status: TransactionStatus;
+  createdAt: Date;
+  completedAt?: Date;
+  description?: string;
+  metadata?: Record<string, unknown>;
+}
+
+export class Transaction {
+  readonly id: string;
+  readonly walletId: string;
+  readonly type: TransactionType;
+  readonly amount: Money;
+  readonly platformFee: Money;
+  readonly netAmount: Money;
+  readonly status: TransactionStatus;
+  readonly createdAt: Date;
+  readonly completedAt?: Date;
+  readonly description?: string;
+  readonly metadata?: Record<string, unknown>;
+
+  private constructor(props: TransactionProps) {
+    this.id = props.id;
+    this.walletId = props.walletId;
+    this.type = props.type;
+    this.amount = props.amount;
+    this.platformFee = props.platformFee;
+    this.netAmount = props.netAmount;
+    this.status = props.status;
+    this.createdAt = props.createdAt;
+    this.completedAt = props.completedAt;
+    this.description = props.description;
+    this.metadata = props.metadata;
+  }
+
+  static create(props: Omit<TransactionProps, 'createdAt' | 'status' | 'platformFee' | 'netAmount'> & {
+    createdAt?: Date;
+    status?: TransactionStatus;
+  }): Transaction {
+    this.validate(props);
+
+    const platformFee = props.amount.calculatePlatformFee();
+    const netAmount = props.amount.calculateNetAmount();
+
+    return new Transaction({
+      ...props,
+      platformFee,
+      netAmount,
+      createdAt: props.createdAt ?? new Date(),
+      status: props.status ?? 'pending',
+    });
+  }
+
+  private static validate(props: Omit<TransactionProps, 'createdAt' | 'status' | 'platformFee' | 'netAmount'>): void {
+    if (!props.id || props.id.trim().length === 0) {
+      throw new Error('Transaction ID is required');
+    }
+
+    if (!props.walletId || props.walletId.trim().length === 0) {
+      throw new Error('Transaction walletId is required');
+    }
+
+    if (!props.type) {
+      throw new Error('Transaction type is required');
+    }
+
+    if (!props.amount) {
+      throw new Error('Transaction amount is required');
+    }
+
+    if (props.amount.amount <= 0) {
+      throw new Error('Transaction amount must be greater than zero');
+    }
+  }
+
+  /**
+   * Mark transaction as completed
+   */
+  complete(): Transaction {
+    if (this.status === 'completed') {
+      throw new Error('Transaction is already completed');
+    }
+
+    if (this.status === 'failed' || this.status === 'cancelled') {
+      throw new Error('Cannot complete a failed or cancelled transaction');
+    }
+
+    return new Transaction({
+      ...this,
+      status: 'completed',
+      completedAt: new Date(),
+    });
+  }
+
+  /**
+   * Mark transaction as failed
+   */
+  fail(): Transaction {
+    if (this.status === 'completed') {
+      throw new Error('Cannot fail a completed transaction');
+    }
+
+    return new Transaction({
+      ...this,
+      status: 'failed',
+    });
+  }
+
+  /**
+   * Cancel transaction
+   */
+  cancel(): Transaction {
+    if (this.status === 'completed') {
+      throw new Error('Cannot cancel a completed transaction');
+    }
+
+    return new Transaction({
+      ...this,
+      status: 'cancelled',
+    });
+  }
+
+  /**
+   * Check if transaction is completed
+   */
+  isCompleted(): boolean {
+    return this.status === 'completed';
+  }
+
+  /**
+   * Check if transaction is pending
+   */
+  isPending(): boolean {
+    return this.status === 'pending';
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/domain/repositories/ILeagueWalletRepository.ts b/packages/racing/domain/repositories/ILeagueWalletRepository.ts
new file mode 100644
index 000000000..34cac6f1d
--- /dev/null
+++ b/packages/racing/domain/repositories/ILeagueWalletRepository.ts
@@ -0,0 +1,16 @@
+/**
+ * Repository Interface: ILeagueWalletRepository
+ * 
+ * Defines operations for LeagueWallet aggregate persistence
+ */
+
+import type { LeagueWallet } from '../entities/LeagueWallet';
+
+export interface ILeagueWalletRepository {
+  findById(id: string): Promise<LeagueWallet | null>;
+  findByLeagueId(leagueId: string): Promise<LeagueWallet | null>;
+  create(wallet: LeagueWallet): Promise<LeagueWallet>;
+  update(wallet: LeagueWallet): Promise<LeagueWallet>;
+  delete(id: string): Promise<void>;
+  exists(id: string): Promise<boolean>;
+}
\ No newline at end of file
diff --git a/packages/racing/domain/repositories/ILiveryRepository.ts b/packages/racing/domain/repositories/ILiveryRepository.ts
new file mode 100644
index 000000000..8017dd7d7
--- /dev/null
+++ b/packages/racing/domain/repositories/ILiveryRepository.ts
@@ -0,0 +1,26 @@
+/**
+ * Repository Interface: ILiveryRepository
+ * 
+ * Defines operations for livery-related entities
+ */
+
+import type { DriverLivery } from '../entities/DriverLivery';
+import type { LiveryTemplate } from '../entities/LiveryTemplate';
+
+export interface ILiveryRepository {
+  // DriverLivery operations
+  findDriverLiveryById(id: string): Promise<DriverLivery | null>;
+  findDriverLiveriesByDriverId(driverId: string): Promise<DriverLivery[]>;
+  findDriverLiveryByDriverAndCar(driverId: string, carId: string): Promise<DriverLivery | null>;
+  createDriverLivery(livery: DriverLivery): Promise<DriverLivery>;
+  updateDriverLivery(livery: DriverLivery): Promise<DriverLivery>;
+  deleteDriverLivery(id: string): Promise<void>;
+
+  // LiveryTemplate operations
+  findTemplateById(id: string): Promise<LiveryTemplate | null>;
+  findTemplatesBySeasonId(seasonId: string): Promise<LiveryTemplate[]>;
+  findTemplateBySeasonAndCar(seasonId: string, carId: string): Promise<LiveryTemplate | null>;
+  createTemplate(template: LiveryTemplate): Promise<LiveryTemplate>;
+  updateTemplate(template: LiveryTemplate): Promise<LiveryTemplate>;
+  deleteTemplate(id: string): Promise<void>;
+}
\ No newline at end of file
diff --git a/packages/racing/domain/repositories/IPrizeRepository.ts b/packages/racing/domain/repositories/IPrizeRepository.ts
new file mode 100644
index 000000000..0142932e3
--- /dev/null
+++ b/packages/racing/domain/repositories/IPrizeRepository.ts
@@ -0,0 +1,19 @@
+/**
+ * Repository Interface: IPrizeRepository
+ * 
+ * Defines operations for Prize entity persistence
+ */
+
+import type { Prize, PrizeStatus } from '../entities/Prize';
+
+export interface IPrizeRepository {
+  findById(id: string): Promise<Prize | null>;
+  findBySeasonId(seasonId: string): Promise<Prize[]>;
+  findByDriverId(driverId: string): Promise<Prize[]>;
+  findByStatus(status: PrizeStatus): Promise<Prize[]>;
+  findBySeasonAndPosition(seasonId: string, position: number): Promise<Prize | null>;
+  create(prize: Prize): Promise<Prize>;
+  update(prize: Prize): Promise<Prize>;
+  delete(id: string): Promise<void>;
+  exists(id: string): Promise<boolean>;
+}
\ No newline at end of file
diff --git a/packages/racing/domain/repositories/ISeasonSponsorshipRepository.ts b/packages/racing/domain/repositories/ISeasonSponsorshipRepository.ts
new file mode 100644
index 000000000..717650a64
--- /dev/null
+++ b/packages/racing/domain/repositories/ISeasonSponsorshipRepository.ts
@@ -0,0 +1,18 @@
+/**
+ * Repository Interface: ISeasonSponsorshipRepository
+ * 
+ * Defines operations for SeasonSponsorship aggregate persistence
+ */
+
+import type { SeasonSponsorship, SponsorshipTier } from '../entities/SeasonSponsorship';
+
+export interface ISeasonSponsorshipRepository {
+  findById(id: string): Promise<SeasonSponsorship | null>;
+  findBySeasonId(seasonId: string): Promise<SeasonSponsorship[]>;
+  findBySponsorId(sponsorId: string): Promise<SeasonSponsorship[]>;
+  findBySeasonAndTier(seasonId: string, tier: SponsorshipTier): Promise<SeasonSponsorship[]>;
+  create(sponsorship: SeasonSponsorship): Promise<SeasonSponsorship>;
+  update(sponsorship: SeasonSponsorship): Promise<SeasonSponsorship>;
+  delete(id: string): Promise<void>;
+  exists(id: string): Promise<boolean>;
+}
\ No newline at end of file
diff --git a/packages/racing/domain/repositories/ISponsorRepository.ts b/packages/racing/domain/repositories/ISponsorRepository.ts
new file mode 100644
index 000000000..97a0bf4d3
--- /dev/null
+++ b/packages/racing/domain/repositories/ISponsorRepository.ts
@@ -0,0 +1,17 @@
+/**
+ * Repository Interface: ISponsorRepository
+ * 
+ * Defines operations for Sponsor aggregate persistence
+ */
+
+import type { Sponsor } from '../entities/Sponsor';
+
+export interface ISponsorRepository {
+  findById(id: string): Promise<Sponsor | null>;
+  findAll(): Promise<Sponsor[]>;
+  findByEmail(email: string): Promise<Sponsor | null>;
+  create(sponsor: Sponsor): Promise<Sponsor>;
+  update(sponsor: Sponsor): Promise<Sponsor>;
+  delete(id: string): Promise<void>;
+  exists(id: string): Promise<boolean>;
+}
\ No newline at end of file
diff --git a/packages/racing/domain/repositories/ITransactionRepository.ts b/packages/racing/domain/repositories/ITransactionRepository.ts
new file mode 100644
index 000000000..8342a55da
--- /dev/null
+++ b/packages/racing/domain/repositories/ITransactionRepository.ts
@@ -0,0 +1,17 @@
+/**
+ * Repository Interface: ITransactionRepository
+ * 
+ * Defines operations for Transaction entity persistence
+ */
+
+import type { Transaction, TransactionType } from '../entities/Transaction';
+
+export interface ITransactionRepository {
+  findById(id: string): Promise<Transaction | null>;
+  findByWalletId(walletId: string): Promise<Transaction[]>;
+  findByType(type: TransactionType): Promise<Transaction[]>;
+  create(transaction: Transaction): Promise<Transaction>;
+  update(transaction: Transaction): Promise<Transaction>;
+  delete(id: string): Promise<void>;
+  exists(id: string): Promise<boolean>;
+}
\ No newline at end of file
diff --git a/packages/racing/domain/value-objects/LiveryDecal.ts b/packages/racing/domain/value-objects/LiveryDecal.ts
new file mode 100644
index 000000000..5bfa567f0
--- /dev/null
+++ b/packages/racing/domain/value-objects/LiveryDecal.ts
@@ -0,0 +1,127 @@
+/**
+ * Value Object: LiveryDecal
+ * Represents a decal/logo placed on a livery
+ */
+
+export type DecalType = 'sponsor' | 'user';
+
+export interface LiveryDecalProps {
+  id: string;
+  imageUrl: string;
+  x: number;
+  y: number;
+  width: number;
+  height: number;
+  zIndex: number;
+  type: DecalType;
+}
+
+export class LiveryDecal {
+  readonly id: string;
+  readonly imageUrl: string;
+  readonly x: number;
+  readonly y: number;
+  readonly width: number;
+  readonly height: number;
+  readonly zIndex: number;
+  readonly type: DecalType;
+
+  private constructor(props: LiveryDecalProps) {
+    this.id = props.id;
+    this.imageUrl = props.imageUrl;
+    this.x = props.x;
+    this.y = props.y;
+    this.width = props.width;
+    this.height = props.height;
+    this.zIndex = props.zIndex;
+    this.type = props.type;
+  }
+
+  static create(props: LiveryDecalProps): LiveryDecal {
+    this.validate(props);
+    return new LiveryDecal(props);
+  }
+
+  private static validate(props: LiveryDecalProps): void {
+    if (!props.id || props.id.trim().length === 0) {
+      throw new Error('LiveryDecal ID is required');
+    }
+
+    if (!props.imageUrl || props.imageUrl.trim().length === 0) {
+      throw new Error('LiveryDecal imageUrl is required');
+    }
+
+    if (props.x < 0 || props.x > 1) {
+      throw new Error('LiveryDecal x coordinate must be between 0 and 1 (normalized)');
+    }
+
+    if (props.y < 0 || props.y > 1) {
+      throw new Error('LiveryDecal y coordinate must be between 0 and 1 (normalized)');
+    }
+
+    if (props.width <= 0 || props.width > 1) {
+      throw new Error('LiveryDecal width must be between 0 and 1 (normalized)');
+    }
+
+    if (props.height <= 0 || props.height > 1) {
+      throw new Error('LiveryDecal height must be between 0 and 1 (normalized)');
+    }
+
+    if (!Number.isInteger(props.zIndex) || props.zIndex < 0) {
+      throw new Error('LiveryDecal zIndex must be a non-negative integer');
+    }
+
+    if (!props.type) {
+      throw new Error('LiveryDecal type is required');
+    }
+  }
+
+  /**
+   * Move decal to new position
+   */
+  moveTo(x: number, y: number): LiveryDecal {
+    return LiveryDecal.create({
+      ...this,
+      x,
+      y,
+    });
+  }
+
+  /**
+   * Resize decal
+   */
+  resize(width: number, height: number): LiveryDecal {
+    return LiveryDecal.create({
+      ...this,
+      width,
+      height,
+    });
+  }
+
+  /**
+   * Change z-index
+   */
+  setZIndex(zIndex: number): LiveryDecal {
+    return LiveryDecal.create({
+      ...this,
+      zIndex,
+    });
+  }
+
+  /**
+   * Check if this decal overlaps with another
+   */
+  overlapsWith(other: LiveryDecal): boolean {
+    const thisRight = this.x + this.width;
+    const thisBottom = this.y + this.height;
+    const otherRight = other.x + other.width;
+    const otherBottom = other.y + other.height;
+
+    return !(
+      thisRight <= other.x ||
+      this.x >= otherRight ||
+      thisBottom <= other.y ||
+      this.y >= otherBottom
+    );
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/domain/value-objects/MembershipFee.ts b/packages/racing/domain/value-objects/MembershipFee.ts
new file mode 100644
index 000000000..4bd7a7008
--- /dev/null
+++ b/packages/racing/domain/value-objects/MembershipFee.ts
@@ -0,0 +1,74 @@
+/**
+ * Value Object: MembershipFee
+ * Represents membership fee configuration for league drivers
+ */
+
+import type { Money } from './Money';
+
+export type MembershipFeeType = 'season' | 'monthly' | 'per_race';
+
+export interface MembershipFeeProps {
+  type: MembershipFeeType;
+  amount: Money;
+}
+
+export class MembershipFee {
+  readonly type: MembershipFeeType;
+  readonly amount: Money;
+
+  private constructor(props: MembershipFeeProps) {
+    this.type = props.type;
+    this.amount = props.amount;
+  }
+
+  static create(type: MembershipFeeType, amount: Money): MembershipFee {
+    if (!type) {
+      throw new Error('MembershipFee type is required');
+    }
+
+    if (!amount) {
+      throw new Error('MembershipFee amount is required');
+    }
+
+    if (amount.amount < 0) {
+      throw new Error('MembershipFee amount cannot be negative');
+    }
+
+    return new MembershipFee({ type, amount });
+  }
+
+  /**
+   * Get platform fee for this membership fee
+   */
+  getPlatformFee(): Money {
+    return this.amount.calculatePlatformFee();
+  }
+
+  /**
+   * Get net amount after platform fee
+   */
+  getNetAmount(): Money {
+    return this.amount.calculateNetAmount();
+  }
+
+  /**
+   * Check if this is a recurring fee
+   */
+  isRecurring(): boolean {
+    return this.type === 'monthly';
+  }
+
+  /**
+   * Get display name for fee type
+   */
+  getDisplayName(): string {
+    switch (this.type) {
+      case 'season':
+        return 'Season Fee';
+      case 'monthly':
+        return 'Monthly Subscription';
+      case 'per_race':
+        return 'Per-Race Fee';
+    }
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/domain/value-objects/Money.ts b/packages/racing/domain/value-objects/Money.ts
new file mode 100644
index 000000000..7c54ce647
--- /dev/null
+++ b/packages/racing/domain/value-objects/Money.ts
@@ -0,0 +1,98 @@
+/**
+ * Value Object: Money
+ * Represents a monetary amount with currency and platform fee calculation
+ */
+
+export type Currency = 'USD' | 'EUR' | 'GBP';
+
+export class Money {
+  private static readonly PLATFORM_FEE_PERCENTAGE = 0.10;
+
+  readonly amount: number;
+  readonly currency: Currency;
+
+  private constructor(amount: number, currency: Currency) {
+    this.amount = amount;
+    this.currency = currency;
+  }
+
+  static create(amount: number, currency: Currency = 'USD'): Money {
+    if (amount < 0) {
+      throw new Error('Money amount cannot be negative');
+    }
+    if (!Number.isFinite(amount)) {
+      throw new Error('Money amount must be a finite number');
+    }
+    return new Money(amount, currency);
+  }
+
+  /**
+   * Calculate platform fee (10%)
+   */
+  calculatePlatformFee(): Money {
+    const feeAmount = this.amount * Money.PLATFORM_FEE_PERCENTAGE;
+    return new Money(feeAmount, this.currency);
+  }
+
+  /**
+   * Calculate net amount after platform fee
+   */
+  calculateNetAmount(): Money {
+    const platformFee = this.calculatePlatformFee();
+    return new Money(this.amount - platformFee.amount, this.currency);
+  }
+
+  /**
+   * Add two money amounts
+   */
+  add(other: Money): Money {
+    if (this.currency !== other.currency) {
+      throw new Error('Cannot add money with different currencies');
+    }
+    return new Money(this.amount + other.amount, this.currency);
+  }
+
+  /**
+   * Subtract two money amounts
+   */
+  subtract(other: Money): Money {
+    if (this.currency !== other.currency) {
+      throw new Error('Cannot subtract money with different currencies');
+    }
+    const result = this.amount - other.amount;
+    if (result < 0) {
+      throw new Error('Subtraction would result in negative amount');
+    }
+    return new Money(result, this.currency);
+  }
+
+  /**
+   * Check if this money is greater than another
+   */
+  isGreaterThan(other: Money): boolean {
+    if (this.currency !== other.currency) {
+      throw new Error('Cannot compare money with different currencies');
+    }
+    return this.amount > other.amount;
+  }
+
+  /**
+   * Check if this money equals another
+   */
+  equals(other: Money): boolean {
+    return this.amount === other.amount && this.currency === other.currency;
+  }
+
+  /**
+   * Format money for display
+   */
+  format(): string {
+    const formatter = new Intl.NumberFormat('en-US', {
+      style: 'currency',
+      currency: this.currency,
+      minimumFractionDigits: 2,
+      maximumFractionDigits: 2,
+    });
+    return formatter.format(this.amount);
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/infrastructure/repositories/InMemoryLeagueWalletRepository.ts b/packages/racing/infrastructure/repositories/InMemoryLeagueWalletRepository.ts
new file mode 100644
index 000000000..2d5b028e0
--- /dev/null
+++ b/packages/racing/infrastructure/repositories/InMemoryLeagueWalletRepository.ts
@@ -0,0 +1,54 @@
+/**
+ * In-Memory Implementation: ILeagueWalletRepository
+ * 
+ * Mock repository for testing and development
+ */
+
+import type { LeagueWallet } from '../../domain/entities/LeagueWallet';
+import type { ILeagueWalletRepository } from '../../domain/repositories/ILeagueWalletRepository';
+
+export class InMemoryLeagueWalletRepository implements ILeagueWalletRepository {
+  private wallets: Map<string, LeagueWallet> = new Map();
+
+  async findById(id: string): Promise<LeagueWallet | null> {
+    return this.wallets.get(id) ?? null;
+  }
+
+  async findByLeagueId(leagueId: string): Promise<LeagueWallet | null> {
+    for (const wallet of this.wallets.values()) {
+      if (wallet.leagueId === leagueId) {
+        return wallet;
+      }
+    }
+    return null;
+  }
+
+  async create(wallet: LeagueWallet): Promise<LeagueWallet> {
+    if (this.wallets.has(wallet.id)) {
+      throw new Error('LeagueWallet with this ID already exists');
+    }
+    this.wallets.set(wallet.id, wallet);
+    return wallet;
+  }
+
+  async update(wallet: LeagueWallet): Promise<LeagueWallet> {
+    if (!this.wallets.has(wallet.id)) {
+      throw new Error('LeagueWallet not found');
+    }
+    this.wallets.set(wallet.id, wallet);
+    return wallet;
+  }
+
+  async delete(id: string): Promise<void> {
+    this.wallets.delete(id);
+  }
+
+  async exists(id: string): Promise<boolean> {
+    return this.wallets.has(id);
+  }
+
+  // Test helper
+  clear(): void {
+    this.wallets.clear();
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/infrastructure/repositories/InMemoryLiveryRepository.ts b/packages/racing/infrastructure/repositories/InMemoryLiveryRepository.ts
new file mode 100644
index 000000000..c9e16c996
--- /dev/null
+++ b/packages/racing/infrastructure/repositories/InMemoryLiveryRepository.ts
@@ -0,0 +1,104 @@
+/**
+ * In-Memory Implementation: ILiveryRepository
+ * 
+ * Mock repository for testing and development
+ */
+
+import type { DriverLivery } from '../../domain/entities/DriverLivery';
+import type { LiveryTemplate } from '../../domain/entities/LiveryTemplate';
+import type { ILiveryRepository } from '../../domain/repositories/ILiveryRepository';
+
+export class InMemoryLiveryRepository implements ILiveryRepository {
+  private driverLiveries: Map<string, DriverLivery> = new Map();
+  private templates: Map<string, LiveryTemplate> = new Map();
+
+  // DriverLivery operations
+  async findDriverLiveryById(id: string): Promise<DriverLivery | null> {
+    return this.driverLiveries.get(id) ?? null;
+  }
+
+  async findDriverLiveriesByDriverId(driverId: string): Promise<DriverLivery[]> {
+    return Array.from(this.driverLiveries.values()).filter(l => l.driverId === driverId);
+  }
+
+  async findDriverLiveryByDriverAndCar(driverId: string, carId: string): Promise<DriverLivery | null> {
+    for (const livery of this.driverLiveries.values()) {
+      if (livery.driverId === driverId && livery.carId === carId) {
+        return livery;
+      }
+    }
+    return null;
+  }
+
+  async createDriverLivery(livery: DriverLivery): Promise<DriverLivery> {
+    if (this.driverLiveries.has(livery.id)) {
+      throw new Error('DriverLivery with this ID already exists');
+    }
+    this.driverLiveries.set(livery.id, livery);
+    return livery;
+  }
+
+  async updateDriverLivery(livery: DriverLivery): Promise<DriverLivery> {
+    if (!this.driverLiveries.has(livery.id)) {
+      throw new Error('DriverLivery not found');
+    }
+    this.driverLiveries.set(livery.id, livery);
+    return livery;
+  }
+
+  async deleteDriverLivery(id: string): Promise<void> {
+    this.driverLiveries.delete(id);
+  }
+
+  // LiveryTemplate operations
+  async findTemplateById(id: string): Promise<LiveryTemplate | null> {
+    return this.templates.get(id) ?? null;
+  }
+
+  async findTemplatesBySeasonId(seasonId: string): Promise<LiveryTemplate[]> {
+    return Array.from(this.templates.values()).filter(t => t.seasonId === seasonId);
+  }
+
+  async findTemplateBySeasonAndCar(seasonId: string, carId: string): Promise<LiveryTemplate | null> {
+    for (const template of this.templates.values()) {
+      if (template.seasonId === seasonId && template.carId === carId) {
+        return template;
+      }
+    }
+    return null;
+  }
+
+  async createTemplate(template: LiveryTemplate): Promise<LiveryTemplate> {
+    if (this.templates.has(template.id)) {
+      throw new Error('LiveryTemplate with this ID already exists');
+    }
+    this.templates.set(template.id, template);
+    return template;
+  }
+
+  async updateTemplate(template: LiveryTemplate): Promise<LiveryTemplate> {
+    if (!this.templates.has(template.id)) {
+      throw new Error('LiveryTemplate not found');
+    }
+    this.templates.set(template.id, template);
+    return template;
+  }
+
+  async deleteTemplate(id: string): Promise<void> {
+    this.templates.delete(id);
+  }
+
+  // Test helpers
+  clearDriverLiveries(): void {
+    this.driverLiveries.clear();
+  }
+
+  clearTemplates(): void {
+    this.templates.clear();
+  }
+
+  clear(): void {
+    this.driverLiveries.clear();
+    this.templates.clear();
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/infrastructure/repositories/InMemorySeasonSponsorshipRepository.ts b/packages/racing/infrastructure/repositories/InMemorySeasonSponsorshipRepository.ts
new file mode 100644
index 000000000..b2d3681a6
--- /dev/null
+++ b/packages/racing/infrastructure/repositories/InMemorySeasonSponsorshipRepository.ts
@@ -0,0 +1,59 @@
+/**
+ * In-Memory Implementation: ISeasonSponsorshipRepository
+ * 
+ * Mock repository for testing and development
+ */
+
+import type { SeasonSponsorship, SponsorshipTier } from '../../domain/entities/SeasonSponsorship';
+import type { ISeasonSponsorshipRepository } from '../../domain/repositories/ISeasonSponsorshipRepository';
+
+export class InMemorySeasonSponsorshipRepository implements ISeasonSponsorshipRepository {
+  private sponsorships: Map<string, SeasonSponsorship> = new Map();
+
+  async findById(id: string): Promise<SeasonSponsorship | null> {
+    return this.sponsorships.get(id) ?? null;
+  }
+
+  async findBySeasonId(seasonId: string): Promise<SeasonSponsorship[]> {
+    return Array.from(this.sponsorships.values()).filter(s => s.seasonId === seasonId);
+  }
+
+  async findBySponsorId(sponsorId: string): Promise<SeasonSponsorship[]> {
+    return Array.from(this.sponsorships.values()).filter(s => s.sponsorId === sponsorId);
+  }
+
+  async findBySeasonAndTier(seasonId: string, tier: SponsorshipTier): Promise<SeasonSponsorship[]> {
+    return Array.from(this.sponsorships.values()).filter(
+      s => s.seasonId === seasonId && s.tier === tier
+    );
+  }
+
+  async create(sponsorship: SeasonSponsorship): Promise<SeasonSponsorship> {
+    if (this.sponsorships.has(sponsorship.id)) {
+      throw new Error('SeasonSponsorship with this ID already exists');
+    }
+    this.sponsorships.set(sponsorship.id, sponsorship);
+    return sponsorship;
+  }
+
+  async update(sponsorship: SeasonSponsorship): Promise<SeasonSponsorship> {
+    if (!this.sponsorships.has(sponsorship.id)) {
+      throw new Error('SeasonSponsorship not found');
+    }
+    this.sponsorships.set(sponsorship.id, sponsorship);
+    return sponsorship;
+  }
+
+  async delete(id: string): Promise<void> {
+    this.sponsorships.delete(id);
+  }
+
+  async exists(id: string): Promise<boolean> {
+    return this.sponsorships.has(id);
+  }
+
+  // Test helper
+  clear(): void {
+    this.sponsorships.clear();
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/infrastructure/repositories/InMemorySponsorRepository.ts b/packages/racing/infrastructure/repositories/InMemorySponsorRepository.ts
new file mode 100644
index 000000000..317e265e3
--- /dev/null
+++ b/packages/racing/infrastructure/repositories/InMemorySponsorRepository.ts
@@ -0,0 +1,58 @@
+/**
+ * In-Memory Implementation: ISponsorRepository
+ * 
+ * Mock repository for testing and development
+ */
+
+import type { Sponsor } from '../../domain/entities/Sponsor';
+import type { ISponsorRepository } from '../../domain/repositories/ISponsorRepository';
+
+export class InMemorySponsorRepository implements ISponsorRepository {
+  private sponsors: Map<string, Sponsor> = new Map();
+
+  async findById(id: string): Promise<Sponsor | null> {
+    return this.sponsors.get(id) ?? null;
+  }
+
+  async findAll(): Promise<Sponsor[]> {
+    return Array.from(this.sponsors.values());
+  }
+
+  async findByEmail(email: string): Promise<Sponsor | null> {
+    for (const sponsor of this.sponsors.values()) {
+      if (sponsor.contactEmail === email) {
+        return sponsor;
+      }
+    }
+    return null;
+  }
+
+  async create(sponsor: Sponsor): Promise<Sponsor> {
+    if (this.sponsors.has(sponsor.id)) {
+      throw new Error('Sponsor with this ID already exists');
+    }
+    this.sponsors.set(sponsor.id, sponsor);
+    return sponsor;
+  }
+
+  async update(sponsor: Sponsor): Promise<Sponsor> {
+    if (!this.sponsors.has(sponsor.id)) {
+      throw new Error('Sponsor not found');
+    }
+    this.sponsors.set(sponsor.id, sponsor);
+    return sponsor;
+  }
+
+  async delete(id: string): Promise<void> {
+    this.sponsors.delete(id);
+  }
+
+  async exists(id: string): Promise<boolean> {
+    return this.sponsors.has(id);
+  }
+
+  // Test helper
+  clear(): void {
+    this.sponsors.clear();
+  }
+}
\ No newline at end of file
diff --git a/packages/racing/infrastructure/repositories/InMemoryTransactionRepository.ts b/packages/racing/infrastructure/repositories/InMemoryTransactionRepository.ts
new file mode 100644
index 000000000..2cdb2cd23
--- /dev/null
+++ b/packages/racing/infrastructure/repositories/InMemoryTransactionRepository.ts
@@ -0,0 +1,53 @@
+/**
+ * In-Memory Implementation: ITransactionRepository
+ * 
+ * Mock repository for testing and development
+ */
+
+import type { Transaction, TransactionType } from '../../domain/entities/Transaction';
+import type { ITransactionRepository } from '../../domain/repositories/ITransactionRepository';
+
+export class InMemoryTransactionRepository implements ITransactionRepository {
+  private transactions: Map<string, Transaction> = new Map();
+
+  async findById(id: string): Promise<Transaction | null> {
+    return this.transactions.get(id) ?? null;
+  }
+
+  async findByWalletId(walletId: string): Promise<Transaction[]> {
+    return Array.from(this.transactions.values()).filter(t => t.walletId === walletId);
+  }
+
+  async findByType(type: TransactionType): Promise<Transaction[]> {
+    return Array.from(this.transactions.values()).filter(t => t.type === type);
+  }
+
+  async create(transaction: Transaction): Promise<Transaction> {
+    if (this.transactions.has(transaction.id)) {
+      throw new Error('Transaction with this ID already exists');
+    }
+    this.transactions.set(transaction.id, transaction);
+    return transaction;
+  }
+
+  async update(transaction: Transaction): Promise<Transaction> {
+    if (!this.transactions.has(transaction.id)) {
+      throw new Error('Transaction not found');
+    }
+    this.transactions.set(transaction.id, transaction);
+    return transaction;
+  }
+
+  async delete(id: string): Promise<void> {
+    this.transactions.delete(id);
+  }
+
+  async exists(id: string): Promise<boolean> {
+    return this.transactions.has(id);
+  }
+
+  // Test helper
+  clear(): void {
+    this.transactions.clear();
+  }
+}
\ No newline at end of file