Class Diagram – Payment Processor System

The Class Diagram for a Payment Processor System shows the main classes involved in the processing of a payment, their properties (attributes), and behaviors (methods). It also highlights relationships such as associations, dependencies, and inheritance between classes.

1. Class: Customer

Attributes:

• customerId: String
• name: String
• email: String
• paymentDetails: PaymentDetails

Methods:

• initiatePayment(amount: double): Payment
• viewTransactionHistory(): List<Transaction>

2. Class: Merchant

Attributes:

• merchantId: String
• name: String
• businessAccount: String

Methods:

• requestPayment(amount: double, customer: Customer): Payment
• refundTransaction(transactionId: String): boolean
• viewSalesReport(): Report

3. Class: Payment

Attributes:

• paymentId: String
• amount: double
• status: String
• date: Date

Methods:

• authorize(): boolean
• process(): boolean
• confirm(): void
• fail(reason: String): void

4. Class: PaymentGateway

Attributes:

• gatewayId: String
• name: String
• endpoint: String

Methods:

• forwardRequest(payment: Payment): boolean
• receiveResponse(): String

5. Class: FraudDetectionService

Attributes:

• riskLevel: String

Methods:

• analyzeTransaction(payment: Payment): boolean
• flagTransaction(): void

6. Class: IssuingBank

Attributes:

• bankId: String
• bankName: String

Methods:

• validateCard(cardNumber: String): boolean
• approvePayment(amount: double): boolean

7. Class: AcquiringBank

Attributes:

• bankId: String
• bankName: String

Methods:

• settleFunds(payment: Payment): boolean
• reversePayment(paymentId: String): boolean

8. Class: Transaction

Attributes:

• transactionId: String
• payment: Payment
• timestamp: Date
• status: String

Methods:

• getTransactionDetails(): String
• updateStatus(newStatus: String): void

9. Class: SystemAdministrator

Attributes:

• adminId: String
• name: String

Methods:

• configureGateway(gateway: PaymentGateway): void
• viewSystemLogs(): void
• generateAnalytics(): Report

Relationships:

• Customer initiates Payment
• Merchant creates Payment and interacts with PaymentGateway
• Payment is processed via PaymentGateway, which communicates with IssuingBank and AcquiringBank
• FraudDetectionService performs analysis before the Payment is finalized
• Transaction stores the result of each Payment
• SystemAdministrator monitors and configures PaymentGateway and other settings