store: redis
no Idempotency-Key header          -> HTTP 400  replayed=-    retry-after=-    {"title":"Idempotency-Key header is required for this operation","status":400}
key of 256 characters              -> HTTP 400  replayed=-    retry-after=-    {"title":"Idempotency-Key is longer than 255 characters","status":400}
key of 255 characters              -> HTTP 201  replayed=-    retry-after=-    {"id":1,"customer":"cus_42","amount":1999,"currency":"INR"}
payments in the table: 1