What tools or approaches would you use to simulate simultaneous requests?

Any suggestions are welcome?

​@Ramanan 

To address this issue and ensure that the payment gateway functions correctly, consider implementing the following testing strategies:

1. Concurrency Testing

• Simulate Multiple Requests: Use tools like JMeter or Postman to simulate multiple simultaneous requests to test how the API handles them.
• Check for Race Conditions: Monitor how the system behaves when multiple requests are made at once and ensure that it correctly manages account balances.

2. Boundary Testing

• Test Edge Cases: Create test cases where the account balance is exactly at or just below the required amount (e.g., ₹10,000 and ₹15,000) to see how the API responds.
• Verify Responses: Ensure that when a request exceeds the available balance, it returns an appropriate error message and does not process the transaction.