pos-system/microservices/services/wallet-service-net/SERVICE_DOCS.md

WalletService - Service Documentation

Auto-generated from source code audit. Last updated: 2026-03-13.

Overview

WalletService is a microservice responsible for digital wallet management, loyalty points, escrow/hold operations, and payment gateway integration. It follows Clean Architecture + CQRS patterns with MediatR.

• Port: 5004 (Development)
• Database: wallet_service (Neon PostgreSQL)
• Framework: .NET 10.0, ASP.NET Core
• Auth: JWT Bearer (Duende IdentityServer)
• Payment Gateway: VNPay (sandbox, API v2.1.0)
• Multi-tenancy: User-level tenant isolation via EF Core global query filters + PostgreSQL RLS session variables
• Multi-currency: VND (id=1), USD (id=2), PPoint/Loyalty Points (id=3)

Key Capabilities

1. Wallet Management - Create, deposit, withdraw, transfer, freeze/unfreeze/close wallets with multi-currency support
2. Currency Exchange - Atomic in-wallet exchange between VND, USD, and PPoint with configurable rates
3. Loyalty Points - Separate point account system with earn, spend, expire, bonus, and admin adjustment
4. Escrow/Holds - Lock funds for campaigns/orders with partial execute/release/cancel
5. Payment Gateway - VNPay integration for external payments with IPN callback validation
6. Admin Backoffice - Full admin CRUD, statistics, search, freeze/unfreeze, balance/points adjustment

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API Endpoints

Wallets (/api/v1/wallets) - [Authorize]

Method	Path	Description	Auth
GET	/{userId:guid}	Get wallet by user ID	Bearer
POST	/	Create new wallet	Bearer
POST	/{userId:guid}/deposit	Deposit money into wallet	Bearer
POST	/{userId:guid}/withdraw	Withdraw money from wallet	Bearer
GET	/{userId:guid}/transactions	Get wallet transactions (paginated)	Bearer

Points (/api/v1/points) - [Authorize]

Method	Path	Description	Auth
GET	/{userId:guid}	Get point account by user ID	Bearer
POST	/	Create new point account	Bearer
POST	/{userId:guid}/earn	Earn points	Bearer
POST	/{userId:guid}/spend	Spend points	Bearer
GET	/{userId:guid}/transactions	Get point transactions (paginated)	Bearer

Payments (/api/v1/payments)

Method	Path	Description	Auth
POST	/create	Create payment via gateway (VNPay)	Bearer
GET	/{orderId:guid}	Get payment by order ID	Bearer
GET	/vnpay/callback	VNPay IPN callback	Anonymous
GET	/vnpay/return	VNPay customer return URL	Anonymous

Escrow/Holds (/api/v1/wallets/{walletId:guid}/holds) - [Authorize]

Method	Path	Description	Auth
POST	/	Create escrow hold	Bearer
GET	/{holdId:guid}	Get hold by ID (501 Not Implemented)	Bearer
POST	/{holdId:guid}/execute	Execute (commit) hold portion	Bearer
POST	/{holdId:guid}/release	Release hold portion back to wallet	Bearer
POST	/{holdId:guid}/cancel	Cancel hold, release all remaining	Bearer

Admin Wallets (/api/v1/admin/wallets) - [Authorize(Roles = "Admin,SuperAdmin")]

Method	Path	Description	Auth
GET	/	Get all wallets (paginated, filterable)	Admin
GET	/{walletId:guid}	Get wallet by ID with details	Admin
POST	/{walletId:guid}/freeze	Freeze wallet	Admin
POST	/{walletId:guid}/unfreeze	Unfreeze wallet	Admin
POST	/{walletId:guid}/adjust	Adjust wallet balance (credit/debit)	Admin
GET	/statistics	Get wallet statistics	Admin
GET	/search	Search wallets by userId/walletId/status	Admin

Admin Points (/api/v1/admin/points) - [Authorize(Roles = "Admin,SuperAdmin")]

Method	Path	Description	Auth
GET	/	Get all point accounts (paginated, filterable)	Admin
GET	/{accountId:guid}	Get point account by ID	Admin
POST	/{accountId:guid}/adjust	Adjust points (add/subtract)	Admin
POST	/{accountId:guid}/bonus	Grant bonus points	Admin
GET	/statistics	Get points statistics	Admin
GET	/search	Search point accounts by userId	Admin

Health (/api/v1/health) - [AllowAnonymous]

Method	Path	Description
GET	/live	Liveness probe
GET	/ready	Readiness probe

Also mapped via MapHealthChecks: /health, /health/live, /health/ready

---

Commands

Wallet Commands

Command	Input	Logic	Validator
CreateWalletCommand	UserId, Currency="VND"	Check duplicate by userId, parse CurrencyType, create Wallet + initial WalletItem(balance=0), raise WalletCreatedDomainEvent	UserId NotEmpty; Currency NotEmpty, MaxLength(10)
DepositCommand	UserId, Amount, Description, ReferenceId?	Get wallet by userId, deposit with default CurrencyType, add WalletTransaction(Credit), raise WalletBalanceChangedDomainEvent	UserId NotEmpty; Amount > 0, <= 1B; Description NotEmpty, MaxLength(500); ReferenceId MaxLength(100)
WithdrawCommand	UserId, Amount, Description, ReferenceId?	Get wallet by userId, validate sufficient balance, withdraw with default CurrencyType, add WalletTransaction(Debit), raise WalletBalanceChangedDomainEvent	Same as Deposit
ExchangeCommand	UserId, FromAmount, FromCurrencyTypeId, ToCurrencyTypeId, CustomRate?	Get wallet, parse CurrencyTypes from IDs, calculate rate (custom or from BaseExchangeRate), atomic Withdraw + Deposit within aggregate, raise WalletExchangedDomainEvent	UserId NotEmpty; FromAmount > 0; From/ToCurrencyTypeId > 0 and not equal; CustomRate > 0 (if provided)

Escrow Commands

Command	Input	Logic	Validator
CreateHoldCommand	UserId, Amount, CurrencyCode, ReferenceType, ReferenceId, Description, ExpiresAt?	Get wallet by userId, parse CurrencyType, check balance, subtract from available, create HoldItem, add WalletTransaction(HoldCreated), raise EscrowHeldDomainEvent	None
ExecuteHoldCommand	WalletId, HoldId, Amount, ExecutionRef?	Get wallet by ID, find hold, validate active+not expired, execute portion, add WalletTransaction(HoldExecuted), raise EscrowExecutedDomainEvent	None
ReleaseHoldCommand	WalletId, HoldId, Amount? (null=all)	Get wallet by ID, find hold, release portion back to available balance, add WalletTransaction(HoldReleased), raise EscrowReleasedDomainEvent	None
CancelHoldCommand	WalletId, HoldId	Get wallet by ID, release all remaining hold amount back to wallet	None

Points Commands

Command	Input	Logic	Validator
CreatePointAccountCommand	UserId	Check duplicate, create PointAccount with 0 points	UserId NotEmpty
EarnPointsCommand	UserId, Points, Source, Description, ExpiryMonths?=12	Get account by userId, earn points, add PointTransaction(Earn), raise PointsEarnedDomainEvent	UserId NotEmpty; Points > 0; Source NotEmpty, MaxLength(100); Description NotEmpty, MaxLength(500); ExpiryMonths > 0, <= 120
SpendPointsCommand	UserId, Points, Source, Description	Get account by userId, validate sufficient points, spend, add PointTransaction(Spend), raise PointsSpentDomainEvent	UserId NotEmpty; Points > 0; Source NotEmpty, MaxLength(100); Description NotEmpty, MaxLength(500)

Payment Commands

Command	Input	Logic	Validator
CreatePaymentCommand	OrderId, Amount, Currency, GatewayName, ReturnUrl, IpAddress	Find gateway by name, create Payment entity, call gateway.CreatePaymentAsync, mark Processing or Failed, raise PaymentCreatedDomainEvent	OrderId NotEmpty; Amount > 0; Currency NotEmpty, MaxLength(10); GatewayName NotEmpty, MaxLength(50); ReturnUrl valid URL; IpAddress NotEmpty
ProcessPaymentCallbackCommand	GatewayName, Parameters (dict)	Find gateway, validate HMAC-SHA512 hash, find payment by orderId (vnp_TxnRef), complete or fail based on vnp_ResponseCode, raise PaymentCompletedDomainEvent or PaymentFailedDomainEvent	GatewayName NotEmpty; Parameters NotNull, Count > 0

Admin Commands

Command	Input	Logic	Validator
AdminFreezeWalletCommand	WalletId, Reason, AdminId	Get wallet by ID, call Freeze() (status Active->Frozen)	None
AdminUnfreezeWalletCommand	WalletId, Reason, AdminId	Get wallet by ID, call Unfreeze() (status Frozen->Active)	None
AdminAdjustBalanceCommand	WalletId, Amount, CurrencyTypeId, Reason, AdminId	Get wallet, positive amount=Deposit, negative=Withdraw, with admin reason	None
AdminAdjustPointsCommand	AccountId, Points, Reason, AdminId	Get point account by ID, call AdjustPoints (positive=add, negative=subtract)	None
AdminGrantBonusCommand	AccountId, Points, Reason, ExpiryMonths?, AdminId	Get point account, call AddBonusPoints with expiry date	None

---

Queries

Query	Input	Output	Logic
GetWalletQuery	UserId	WalletDto? (Id, UserId, Balance, Currency, Status, CreatedAt, UpdatedAt)	Get wallet by userId, return default currency balance
GetWalletTransactionsQuery	UserId, Page=1, PageSize=20	WalletTransactionsDto (paginated list)	Get wallet, then paginated transactions
GetPointAccountQuery	UserId	PointAccountDto? (Id, UserId, TotalPoints, AvailablePoints, dates)	Get point account by userId
GetPointTransactionsQuery	UserId, Page=1, PageSize=20	PointTransactionsDto (paginated list)	Get account, then paginated transactions
GetPaymentByOrderIdQuery	OrderId	PaymentDto?	Find payment by orderId
GetPaymentByTransactionIdQuery	TransactionId (string)	PaymentDto?	Find payment by gateway transaction ID
GetAllWalletsQuery	Page, PageSize, Status?, Currency?	AdminWalletsListDto (paginated)	Admin: filter by status, include balances
GetWalletByIdQuery	WalletId	AdminWalletDetailDto?	Admin: include balances + transactions count
SearchWalletsQuery	UserId?, WalletId?, Status?	List<AdminWalletDetailDto> (max 50)	Admin: flexible search
GetWalletStatisticsQuery	(none)	WalletStatisticsDto	Admin: total/active/frozen/closed counts, balance by currency, today's transactions
GetAllPointAccountsQuery	Page, PageSize, MinPoints?, MaxPoints?	AdminPointAccountsListDto (paginated)	Admin: filter by point range
GetPointAccountByIdQuery	AccountId	AdminPointAccountDetailDto?	Admin: include transaction count
SearchPointAccountsQuery	UserId?	List<AdminPointAccountDetailDto> (max 50)	Admin: search by userId
GetPointsStatisticsQuery	(none)	PointsStatisticsDto	Admin: totals for issued/available/spent/expired points, today's activity

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Domain Model

Aggregate: Wallet (Root)

Entity: Wallet (extends Entity, IAggregateRoot)

Property	Type	Description
Id	Guid	Wallet ID (generated)
UserId	Guid	User ID from IAM Service
DefaultCurrencyTypeId	int	Default currency (1=VND, 2=USD, 3=PPoint)
StatusId	int	Wallet status (1=Active, 2=Frozen, 3=Closed)
CreatedAt	DateTime	Creation timestamp
UpdatedAt	DateTime	Last update timestamp
Balances	IReadOnlyCollection<WalletItem>	Multi-currency balances (one per currency)
Transactions	IReadOnlyCollection<WalletTransaction>	Transaction history
Holds	IReadOnlyCollection<HoldItem>	Active escrow holds

Behavior Methods:

• Deposit(amount, currencyType, description, referenceId?) - Add funds
• Withdraw(amount, currencyType, description, referenceId?) - Remove funds (validates balance)
• Exchange(fromAmount, fromCurrency, toCurrency, customRate?) - Atomic currency exchange
• TransferOut(amount, toWalletId, description) - Send to another wallet
• TransferIn(amount, fromWalletId, description) - Receive from another wallet
• Hold(amount, currencyType, referenceType, referenceId, description, expiresAt?) - Create escrow hold
• ExecuteHold(holdId, amount, executionRef?) - Commit hold portion
• ReleaseHold(holdId, amount?) - Return hold back to wallet
• CancelHold(holdId) - Release all remaining
• Freeze() - Status -> Frozen (blocks transactions)
• Unfreeze() - Status -> Active
• Close() - Status -> Closed (requires zero balances)

Entity: WalletItem (child of Wallet)

Property	Type	Description
Id	Guid	Item ID
WalletId	Guid	Parent wallet FK
CurrencyTypeId	int	Currency type
Balance	decimal	Current balance
CreatedAt / UpdatedAt	DateTime	Timestamps

Entity: WalletTransaction

Property	Type	Description
Id	Guid	Transaction ID
WalletId	Guid	Parent wallet FK
Amount	Money (value object)	Amount + Currency
TypeId	int	TransactionType enum ID
ReferenceId	string?	External reference
Description	string	Transaction description
BalanceAfter	decimal	Balance after this transaction
CreatedAt	DateTime	Timestamp

Entity: HoldItem (child of Wallet)

Property	Type	Description
Id	Guid	Hold ID
WalletId	Guid	Parent wallet FK
OriginalAmount	decimal	Initial held amount
RemainingAmount	decimal	Currently held
ExecutedAmount	decimal	Total committed
ReleasedAmount	decimal	Total returned
CurrencyTypeId	int	Currency type
ReferenceType	string	e.g., "CAMPAIGN", "ORDER"
ReferenceId	Guid	External reference ID
Description	string	Hold description
StatusId	int	HoldStatus enum ID
ExpiresAt	DateTime?	Optional expiration
CreatedAt / UpdatedAt	DateTime	Timestamps

Value Object: Money

• Amount (decimal) + Currency (string, uppercase)
• Methods: Add, Subtract, IsGreaterThanOrEqual

Enumerations:

Enumeration	Values
CurrencyType	VND(1, rate=1), USD(2, rate=25000), PPoint(3, rate=1000)
TransactionType	Credit(1), Debit(2), TransferOut(3), TransferIn(4), Refund(5), HoldCreated(6), HoldExecuted(7), HoldReleased(8)
WalletStatus	Active(1), Frozen(2), Closed(3)
HoldStatus	Active(1), PartiallyReleased(2), Released(3), Executed(4), Cancelled(5)

Aggregate: PointAccount (Root)

Entity: PointAccount (extends Entity, IAggregateRoot)

Property	Type	Description
Id	Guid	Account ID
UserId	Guid	User ID from IAM Service
TotalPoints	long	Lifetime earned points
AvailablePoints	long	Currently usable points
CreatedAt / UpdatedAt	DateTime	Timestamps
Transactions	IReadOnlyCollection<PointTransaction>	Transaction history

Behavior Methods:

• EarnPoints(points, source, description, expiresAt?) - Add points
• SpendPoints(points, source, description) - Deduct points (validates balance)
• ExpirePoints(points, description) - System expiration
• AddBonusPoints(points, source, description, expiresAt?) - Special promotion bonus
• AdjustPoints(adjustment, reason) - Admin manual adjustment

Entity: PointTransaction

Property	Type	Description
Id	Guid	Transaction ID
AccountId	Guid	Parent account FK
Points	long	Point amount
TypeId	int	PointTransactionType enum ID
Source	string	e.g., order ID, "ADMIN"
Description	string	Transaction description
ExpiresAt	DateTime?	Point expiration date
BalanceAfter	long	Balance after transaction
CreatedAt	DateTime	Timestamp

Enumeration: PointTransactionType

• Earn(1), Spend(2), Expire(3), Adjust(4), Bonus(5)

Aggregate: Payment (Root)

Entity: Payment (extends Entity, IAggregateRoot) - uses private fields

Property	Type	Description
Id	Guid	Payment ID
OrderId	Guid	Associated order
Amount	decimal	Payment amount
Currency	string	Currency code
GatewayName	string	e.g., "VNPAY"
TransactionId	string?	Gateway transaction ID
PaymentUrl	string?	Customer redirect URL
StatusId	int	PaymentStatus enum ID
ErrorCode / ErrorMessage	string?	Failure details
CreatedAt	DateTime	Creation timestamp
CompletedAt	DateTime?	Completion timestamp

Behavior Methods:

• MarkAsProcessing(paymentUrl, transactionId?) - Pending -> Processing
• Complete(transactionId) - Pending/Processing -> Completed
• Fail(errorCode, errorMessage) - Pending/Processing -> Failed
• Refund() - Completed -> Refunded

Enumeration: PaymentStatus

• Pending(1), Processing(2), Completed(3), Failed(4), Refunded(5)

Domain Events

Event	Properties	Raised When
WalletCreatedDomainEvent	WalletId, UserId, OccurredAt	Wallet constructor
WalletBalanceChangedDomainEvent	WalletId, UserId, TransactionType, Amount, NewBalance	Deposit, Withdraw, Transfer
WalletExchangedDomainEvent	WalletId, UserId, FromCurrencyId, ToCurrencyId, FromAmount, ToAmount, Rate	Currency exchange
EscrowHeldDomainEvent	WalletId, HoldId, UserId, ReferenceType, ReferenceId, Amount, CurrencyTypeId	Hold created
EscrowExecutedDomainEvent	WalletId, HoldId, UserId, Amount, RemainingAmount, ExecutionRef	Hold portion executed
EscrowReleasedDomainEvent	WalletId, HoldId, UserId, Amount, RemainingAmount	Hold portion released
PointsEarnedDomainEvent	AccountId, UserId, Points, NewBalance, Source	Points earned/bonus added
PointsSpentDomainEvent	AccountId, UserId, Points, NewBalance, Source	Points spent
PaymentCreatedDomainEvent	PaymentId, OrderId, Amount, Currency, GatewayName	Payment created
PaymentCompletedDomainEvent	PaymentId, OrderId, TransactionId, Amount, Currency	Payment completed
PaymentFailedDomainEvent	PaymentId, OrderId, ErrorCode, ErrorMessage	Payment failed

Domain Exceptions

Exception	Base	Description
WalletDomainException	Exception	Base wallet domain error
InsufficientBalanceException	WalletDomainException	Balance < requested amount
PointsDomainException	Exception	Base points domain error
InsufficientPointsException	PointsDomainException	Points < requested amount

---

Database Schema

Table: wallets

Column	Type	Nullable	Description
id	uuid	NO	PK, ValueGeneratedNever
user_id	uuid	NO	User ID from IAM
default_currency_type_id	int	NO	Default currency (default=1/VND)
status_id	int	NO	WalletStatus enum ID
created_at	timestamp	NO	Creation time
updated_at	timestamp	NO	Last update

Indexes: ix_wallets_user_id (unique) Query Filter: Tenant isolation by user_id (bypassed for admin/service calls)

Table: wallet_items

Column	Type	Nullable	Description
id	uuid	NO	PK
wallet_id	uuid	NO	FK -> wallets
currency_type_id	int	NO	CurrencyType enum ID
balance	decimal(18,2)	NO	Current balance
created_at	timestamp	NO
updated_at	timestamp	NO

Indexes: ix_wallet_items_wallet_currency (unique: wallet_id + currency_type_id), ix_wallet_items_wallet_id Cascade: Delete with parent wallet

Table: wallet_transactions

Column	Type	Nullable	Description
id	uuid	NO	PK
wallet_id	uuid	NO	FK -> wallets
amount	decimal(18,2)	NO	Transaction amount (owned: Money.Amount)
currency	varchar(3)	NO	Currency code (owned: Money.Currency)
type_id	int	NO	TransactionType enum ID
reference_id	varchar(100)	YES	External reference
description	varchar(500)	NO	Description
balance_after	decimal(18,2)	NO	Balance after transaction
created_at	timestamp	NO

Indexes: ix_wallet_transactions_wallet_id, ix_wallet_transactions_created_at Cascade: Delete with parent wallet

Table: wallet_holds

Column	Type	Nullable	Description
id	uuid	NO	PK
wallet_id	uuid	NO	FK -> wallets
original_amount	decimal(18,2)	NO	Initially held
remaining_amount	decimal(18,2)	NO	Currently held
executed_amount	decimal(18,2)	NO	Total committed
released_amount	decimal(18,2)	NO	Total returned
currency_type_id	int	NO	FK (restrict delete)
reference_type	varchar(50)	NO	e.g., "CAMPAIGN"
reference_id	uuid	NO	External ref ID
description	varchar(500)	NO
status_id	int	NO	FK (restrict delete)
created_at	timestamp	NO
updated_at	timestamp	NO
expires_at	timestamp	YES	Optional expiry

Indexes: ix_wallet_holds_wallet_id, ix_wallet_holds_reference (reference_type + reference_id), ix_wallet_holds_status_id Cascade: Delete with parent wallet

Table: point_accounts

Column	Type	Nullable	Description
id	uuid	NO	PK
user_id	uuid	NO	User ID from IAM
total_points	bigint	NO	Lifetime earned
available_points	bigint	NO	Currently usable
created_at	timestamp	NO
updated_at	timestamp	NO

Indexes: ix_point_accounts_user_id (unique)

Table: point_transactions

Column	Type	Nullable	Description
id	uuid	NO	PK
account_id	uuid	NO	FK -> point_accounts
points	bigint	NO	Point amount
type_id	int	NO	PointTransactionType enum ID
source	varchar(100)	NO	Source identifier
description	varchar(500)	NO
expires_at	timestamp	YES	Point expiration
balance_after	bigint	NO	Balance after transaction
created_at	timestamp	NO

Indexes: ix_point_transactions_account_id, ix_point_transactions_created_at, ix_point_transactions_expires_at Cascade: Delete with parent account

Table: payments

Column	Type	Nullable	Description
id	uuid	NO	PK
order_id	uuid	NO	Associated order
amount	decimal(18,2)	NO	Payment amount
currency	varchar(10)	NO	Currency code
gateway_name	varchar(50)	NO	e.g., "VNPAY"
transaction_id	varchar(255)	YES	Gateway transaction ID
payment_url	varchar(2048)	YES	Customer redirect URL
status_id	int	NO	PaymentStatus enum ID
error_code	varchar(50)	YES
error_message	varchar(500)	YES
created_at	timestamp	NO
completed_at	timestamp	YES

Indexes: ix_payments_order_id, ix_payments_transaction_id, ix_payments_status_id, ix_payments_gateway_name

Migrations

1. 20260117141548_AddWalletHolds - Initial schema with holds
2. 20260306175521_PhaseTwo - Phase 2 additions (payments, multi-currency, etc.)

---

Dependencies

NuGet Packages

API Layer:

• MediatR 12.4.1 (CQRS)
• FluentValidation 11.11.0 + DI Extensions
• Microsoft.AspNetCore.Authentication.JwtBearer 10.0.1
• Asp.Versioning.Mvc 8.1.0
• AspNetCore.HealthChecks.NpgSql 8.0.2, Redis 8.0.1
• Hellang.Middleware.ProblemDetails 6.5.1
• Serilog.AspNetCore 8.0.3, Console 6.0.0, Seq 8.0.0
• Swashbuckle.AspNetCore 7.2.0 + Annotations
• EF Core Design 10.0.0

Domain Layer:

• MediatR.Contracts 2.0.1 (domain events only)

Infrastructure Layer:

• Microsoft.EntityFrameworkCore 10.0.0
• Npgsql.EntityFrameworkCore.PostgreSQL 10.0.0
• MediatR 12.4.1 (domain event dispatch)
• Dapper 2.1.35 (read-optimized queries)
• Polly 8.5.0, Microsoft.Extensions.Http.Polly 9.0.0
• StackExchange.Redis 2.8.16

Service Dependencies

• IAM Service: JWT token validation, user ID claims
• Order Service: OrderId referenced in Payments

---

Configuration

appsettings.json

{
  "ConnectionStrings": {
    "DefaultConnection": "Host=..neon.tech;Database=wallet_service;..."
  },
  "Redis": {
    "ConnectionString": "localhost:6379"
  },
  "Jwt": {
    "Secret": "...",
    "Issuer": "goodgo-platform",
    "Audience": "goodgo-services",
    "AccessTokenExpiryMinutes": 15,
    "RefreshTokenExpiryDays": 7
  }
}

appsettings.Development.json

{
  "VnPay": {
    "TmnCode": "GOODGO01",
    "HashSecret": "GOODGOSECRETKEYFORSANDBOX2026",
    "PaymentUrl": "https://sandbox.vnpayment.vn/paymentv2/vpcpay.html",
    "ReturnUrl": "http://localhost:3001/payment/return",
    "ApiUrl": "https://sandbox.vnpayment.vn/merchant_webapi/api/transaction"
  }
}

Middleware Pipeline Order

1. Serilog request logging
2. ProblemDetails (RFC 7807)
3. Swagger (Development only)
4. CORS (AllowAny)
5. Routing
6. Authentication (JWT Bearer)
7. Authorization
8. TenantMiddleware (RLS - sets PostgreSQL session variables)
9. Health checks + Controllers

MediatR Pipeline Behaviors

1. LoggingBehavior<,> - Request/response logging
2. ValidatorBehavior<,> - FluentValidation in pipeline
3. TransactionBehavior<,> - Auto transaction wrapping for commands

---

Multi-Tenancy

• Wallet isolation: User-level via EF Core global query filter on Wallet.UserId
• Bypass: Admin users and service-to-service calls (via X-Service-Call: internal header)
• PostgreSQL RLS: TenantMiddleware sets SET LOCAL app.current_shop_id and app.current_merchant_id session variables
• Adapter pattern: ITenantProvider (API layer) -> WalletTenantProviderAdapter -> IWalletTenantProvider (Infrastructure layer)

---

Tests

Unit Tests (tests/WalletService.UnitTests/)

• Domain/WalletTests.cs - Wallet entity behavior tests
• Domain/PointAccountTests.cs - PointAccount entity behavior tests
• Domain/HoldItemTests.cs - HoldItem entity behavior tests
• Application/Commands/CreatePaymentCommandHandlerTests.cs - Payment creation handler tests
• Application/Commands/ProcessPaymentCallbackCommandHandlerTests.cs - Callback processing tests
• Application/EscrowCommandHandlersTests.cs - Escrow command handler tests

Functional Tests (tests/WalletService.FunctionalTests/)

• CustomWebApplicationFactory.cs - Test server setup
• Controllers/HealthControllerTests.cs - Health endpoint tests

---

Exchange Rates (Hardcoded in CurrencyType)

From	To	Rate	Example
VND	USD	0.00004	25,000 VND = 1 USD
VND	PPoint	0.001	1,000 VND = 1 PPoint
USD	VND	25,000	1 USD = 25,000 VND
USD	PPoint	25	1 USD = 25 PPoint
PPoint	VND	1,000	1 PPoint = 1,000 VND
PPoint	USD	0.04	25 PPoint = 1 USD

Formula: rate = fromCurrency.BaseExchangeRate / toCurrency.BaseExchangeRate