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Integration Checklist

  1. Implement Base64 envelope (data) for every request.
  2. Implement signature formula and send sign on every request.
  3. For financial operations, always send unique documentExtID from your system.
  4. Support both HTTP and Serial transport with identical business payload.
  5. Handle all API error codes, especially 1, 6, 9, 15, 24, 44, and the absent/null case (see §8, §12.3).
  6. Log raw route, request correlation id, and final API code for supportability.