You had an acquirer that conducted operations through itself. What types of operations did you see and test?

In acquiring, the following types of operations are usually encountered, which I have tested:

• Authorization — checking the availability of funds and blocking the amount on the card.
• Capture — actual deduction of the blocked amount.
• Void — cancellation of a previously performed authorization if a deduction is not required.
• Refund — returning funds after a deduction.
• Balance Inquiry — requesting the current balance of the card.

I tested the correctness of each operation, error handling, timeouts, as well as partial refund and cancellation scenarios. It is important to verify that operations are performed in the correct sequence and are accurately reflected in reports.