Payment gateway
Record a payment an external checkout has already authorised, and capture it when you deliver.
What is this?
Payment gateway records a payment that was authorised somewhere else — typically a webshop checkout that ran the card payment with its own payment service provider. The order and the payment arrive together through the order import API, and Flow Retail captures the money when you deliver.
How does it work?
An imported gateway payment arrives as Authorized: the money is reserved with the provider, but not yet taken. It must carry the provider's own payment reference, or Flow Retail rejects it with External payment reference is missing.
Flow Retail captures the authorisation when the order receipt is completed and the products are delivered. If you have given us a URL to call, we post the capture there; otherwise it is only recorded on the order.
While a payment is still authorised, you can cancel it in Flow Retail. Releasing the reservation with the provider is your side of that. Once the payment is captured, it stays captured.
A gateway payment cannot be refunded. Flow Retail refuses it with Refunds for payment gateway settlements are not supported yet. An authorisation can be captured or cancelled, never sent back through the gateway.
How do we get started?
Ask us to switch on the Payment gateway extension for you. If your provider needs a capture call, give us the URL and we set it up at the same time.
Your webshop or middleware then imports orders with the payment attached. Alongside gateway payments, imported orders also accept invoice, rounding, and your own custom payment methods.
Last updated 17.09.2026
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