Receipt Provider Callback API

Receipt providers POST enriched receipt data to OpenCard when a match is found.

This is the inbound callback API. For the full delivery flow (headers, HMAC, payloads) see Callback delivery.

Base URL

https://api.opencard.io/api

Sandbox: https://sandbox-api.opencard.io/api

X-Data-Signature header — HMAC-SHA256 of the raw request body with your client secret.

Method	Path	Purpose
`POST`	`/v1/service/marcet/callback/{referenceId}`	Deliver matched receipt data

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