Error Reference

All error responses follow this shape:

{
  "success": false,
  "error": "human-readable message"
}

HTTP Status	Meaning	Common cause
`400`	Bad request	Missing or invalid field in request body
`401`	Unauthorized	Missing, expired, or malformed access token
`403`	Forbidden	Token does not have permission for this action
`404`	Not found	Resource ID does not exist
`409`	Conflict	e.g. refund already issued for this intent
`422`	Unprocessable	e.g. no customer wallet on file to refund
`500`	Platform error	Transient server fault — retry with exponential backoff

On 5xx errors: implement retry logic with exponential backoff and jitter. Do not retry 4xx errors without first fixing the request.