> ## Documentation Index
> Fetch the complete documentation index at: https://next-developers.opencard.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Deliver receipt enrichment

> HMAC-SHA256 via X-Data-Signature header.



## OpenAPI

````yaml /openapi/receipt-provider-callback.json post /v1/service/marcet/callback/{referenceId}
openapi: 3.0.3
info:
  title: Receipt Provider Callback
  version: '1.0'
  description: Inbound API for receipt enrichers delivering matched data back to OpenCard.
servers:
  - url: https://api.opencard.io/api
    description: Production
  - url: https://sandbox-api.opencard.io/api
    description: Sandbox
security: []
paths:
  /v1/service/marcet/callback/{referenceId}:
    post:
      tags:
        - Callback
      summary: Deliver receipt enrichment
      description: HMAC-SHA256 via X-Data-Signature header.
      operationId: receiptProviderCallback
      parameters:
        - name: referenceId
          in: path
          required: true
          description: Transaction reference
          schema:
            type: string
        - name: X-Event
          in: header
          required: true
          schema:
            type: string
            enum:
              - CallbackRequestResolved
              - CallbackRequestDeleted
        - name: X-Data-Signature
          in: header
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Accepted
          content:
            application/json: {}

````