hard20 pts · first answer countsapi-testingedge-cases

Double charge bug

Some customers are charged twice. It happens only rarely and only on slow networks. What is the most likely cause to test for?

A.A wrong CSS colour on the pay buttonB.The database has too many indexesC.The UI text is not translatedD.A double submit or client retry is processed twice because the payment API is not idempotent

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Double charge bug

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