Once you have your menu front end, you will be looking to build carts for your guests to checkout from. in the Price Check Request Payload documentation, you can see the expected cart structure:
|fulfillment_method||string||Available fulfillment methods:|
|promo_codes||array of strings||List of promo codes to be checked and applied to the cart|
|table_id||string||ID of the table - this comes from building the menu, above.|
|cart||array of objects||each cart object has a key of line item id -> dictionary with the keys related to the line item. Most of these can be retrieved from the Menus endpoint (full example can be found at Price Check Request Payload|
Begin The Checkout Process !