curl --request POST \ --url https://environment.afterpay.com/v2/checkouts. \ --header 'Accept: application/json' \ --header 'Content-Type: application/json' \ --header 'User-Agent: Readme.io API Simulator' \ --data ' { "amount": { "amount": "0.00" }, "mode": "express", "merchant": { "popupOriginUrl": "https://www.afterpay-merchant.com/cart" } } '