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Invoice creation

POST /v1/invoices is idempotent on (store_id, external_order_id):
  • Existing match → returns the same invoice with HTTP 201
  • Same external_order_id on a different Woo integration → HTTP 409 (EXTERNAL_ORDER_INTEGRATION_CONFLICT)

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Webhook deliveries

Dedupe on X-Meum-Event-Id. See Webhooks overview.