200-901 Question 172
Select 3A developer is analyzing a sequence diagram for a system that integrates with a third-party API for payment processing. The sequence diagram includes the following steps:
- The client application sends a 'POST /payments' request to the Payment API.
- The Payment API responds with a 201 Created status and a payment ID.
- The client application sends a 'GET /payments/{paymentId}' request to check the payment status.
- The Payment API responds with a 200 OK status and the payment status as 'success'.
Which of the following statements correctly interprets the flow of the sequence diagram?
- A
The 'POST /payments' request is used to initiate a payment transaction.
- B
The 'GET /payments/{paymentId}' request is used to retrieve the status of the payment after it has been created.
- C
The 201 Created response indicates that the payment transaction was successful.
- D
The 200 OK response with payment status 'success' confirms that the payment has been processed successfully.
Show answer and explanation
Correct answers: A, B, D
Explanation
The sequence diagram describes the interaction between the client application and the Payment API. The 'POST /payments' request initiates the payment, and the 201 Created response confirms the creation of the payment resource. The 'GET /payments/{paymentId}' request retrieves the status of the payment, and the 200 OK response with a 'success' status indicates that the payment was processed successfully. Understanding how API calls and responses are represented in sequence diagrams is crucial for interpreting system interactions.
- A. Correct.
Correct. The 'POST /payments' request is typically used to create or initiate a payment transaction in a payment processing system.
- B. Correct.
Correct. The 'GET /payments/{paymentId}' request is used to retrieve the current status of a specific payment using its ID.
- C. Incorrect.
Incorrect. The 201 Created response indicates that the payment has been created successfully, but it does not confirm the success of the transaction itself.
- D. Correct.
Correct. The 200 OK response with a status of 'success' confirms that the payment has been processed successfully.