One-off paymentAuthorization onlyIncluding 3DS AuthenticationIncluding 3DS Authentication & Risk assessment Simple example using card payment api onlyUsing:Card Payments APIBrowserMerchant_FrontendMerchant_BackendCard_Payments_APIClick PayPaycustomerInitiatedTransactions requestcustomerInitiatedTransactions responseSettlement requestSettlement responseBrowserMerchant_FrontendMerchant_BackendCard_Payments_API