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Send an Idempotency-Key header with every create request:
Batch Relay stores the first order created for an API account and idempotency key. Replays return the original order record instead of creating a duplicate. Use a stable value from your system:
  • Order ID
  • Workflow run ID
  • External job ID
  • n8n execution ID plus item ID
Do not reuse the same idempotency key for different payloads.