Answer a 3-D Secure challenge message (CReq) with a CRes or Erro message
POST
/cards/3ds/creqHeaders
Idempotency-KeystringOptionalSend on every write that creates or changes money or state; a replay with the same key returns the original result with 200.
Returns
200 OK
Errors
Every error is a problem document with a stable code. See Errors.
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