...

The POS must have previously developed the ability to accept calls from the Price Order Webhook, and respond with a call to the Price Order Webhook Callback (using the callbackUrl parameter sent with the original request).

With a translation service

Calls to the Price Order Webhook send the full basket contents under the cart request parameter. This parameter has a standard format, which must be translated to the format that each POS expects to receive. Typically this is accomplished with a service such as Khumbu. In case a translation service is used, communication between systems happens as follows:

Place order

...