Creates an online payment request for the cart and returns a checkout URL
in params.checkout_url. Share that URL with the end customer to collect
the payment.

Important Notes

• Requires carts:write scope.
• Online payments must be enabled for the company; otherwise the request fails.
• The payment channel is always online; it cannot be selected through the public API.
• Booking reservation errors proxied from platform-sales use legacy single-key codes (e.g. company_payments_disabled, invalid_start_time, booking_already_sold), not the {error, detail} shape.
• The payment request always covers the full cart total.
• When the cart contains service items with on-demand booking instances, the bookings are created and reserved at this point, and params.expires_at is set (about 15 minutes): if the payment is not completed by then, the payment request expires and the reserved bookings are released automatically.
• Creating a new payment request on a cart cancels any previous pending one.

Errors Dictionary