I would like to ask how to obtain the tender_id parameter for refunds. The version used is 20190612

  1. I would like to ask how to obtain the tender_id parameter for refunds. The version used is 20190612

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Based on the information you’ve provided, the following documentation will help answer your question:

Additional Documentation

Get Developer Credentials
Migrate from the Connect V1 Refunds API
Pay or Refund Invoices

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Hello,
To obtain tender id for refunds in this version, refer to your payment platform’s documentation. The tender id is the unique identifier of the original payment method.

With API version 2019-06-12 the supported method of refunding a payment was with the Transactions APIs CreateRefund. This endpoint is now retired and no longer supported. In order to issue refunds with our APIs you’ll need to upgrade to a version that supports our RefundPayment endpoint. :slightly_smiling_face: