This endpoint takes a CartRequest, performs calculations and validations on it, and returns a signed version that can be submitted to the Checkout endpoint.
It is important to note that there are some options that may apply depending on your environment, corporate, venue or vendor configuration:

• Calculate Fees: enable or disable fees calculation that comes from connect.
• Calculate Reductions: enable or disable reductions calculation that comes from connect.
• Calculate Taxes: enable or disable taxes calculation that comes from connect.
• Calculate Modifier Items: enable or disable modifiers items calculation that comes from connect.
• Calculate Payment Partner Integrations also know as PPI Discounts: enable or disable PPI Discounts calculation that is used by AX/IX to integrate Stored Values (SV) and Loaded Values (LV) payments easily.
• Validate Prices: validate each item if the price is correct and if it belongs to the venue/vendor station
• Validate Cart Totals: validate if calculated subtotal is what is expected, you can not use this along with (Fees, Reductions, Taxes, Modifiers or PPI Discounts)

Additional note: When passing in a cart, use tip_status_closed=false to force the tip status to be left open on cart checkout, allowing for a tip to be added in a subsequent tip adjustment endpoint.