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Serial Timeouts and Retry Guidance

  • Frame header read timeout: 3 s
  • Frame payload read timeout: 5 s
  • Initial command response timeout: 30 s
  • /check polling interval: 1000-2000 ms

Retry guidance:​

  • If client did not receive response frame, operation state is unknown.
  • If CRC check fails on a received frame, treat response as not received.
  • Recover financial flow state via /check using the same pay_id.
  • Do not blindly resend /confirm and /cancel on timeout.
  • For /sale and /refund, prefer /check-based recovery before retrying.