About Idempotency-Key, when I cancel the transaction with A1234567890123 and retry the transaction with the same Idempotency-Key A1234567890123, the response is the same as the canceled transaction.
Is it impossible to process the transaction with the same Idempotency-Key when the transaction is canceled or has an issue?
If it is possible, how to process with the same Idempotency-Key?
That is the expected and desired behavior. If you are cancelling the transaction then you would need to start a new transaction with a new idempotency key.
More details on the key can be found here: https://docs.clover.com/docs/tracking-transactions-with-idempotency-keys
there is also a nice blog detailing the different keys and when to use them.
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