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When a request can’t be done, the answer is a problem details document (RFC 9457, Content-Type: application/problem+json):
  • title is short and stable: use it in your code to tell errors apart.
  • detail says what to change, in words you can show to a person.
  • errors (on some 400s) lists messages by field.
  • traceId identifies the request. Include it when you contact Mojo Payments about a failure.

Common refusals

Questions about an error: hello@paymentsmojo.com, with the traceId.