Integration with the EVOSnap* Hosted Payments API for checkout/payment processing is achieved by utilizing a server side script to invoke the JSON integration methods with the EVOSnap* Hosted Payments web service (REST API). The solution type is controlled via the parameter checkout layout.
REST Checkout API
The REST Checkout API offers merchants more control, but it does require server side code hosted with the merchant’s web site. Integration into this method utilizes the same request attributes listed in this section, along with the REST API details mentioned in the Web Services API Integration section.
The end user can be re-directed to/load the merchant’s co-branded checkout/payment interface inside an ‘iframe’ or in the full browser window from the submitted request.
checkout_layoutwith a value of ‘iframe’ optimizes Snap* Hosted Payments for use inside an embedded integration. Omitting this parameter redirects the browser to the merchant specific checkout URL.
Returning to Merchant Site
Regardless of the presentation method selected, the end user is re-directed to the URL specified in the request as
return_url at the conclusion of the Snap* Hosted Payments checkout process. For standard re-direct checkouts the merchant can include the parameter
auto_return and set the value to ‘true’ in the checkout request to bypass the Snap* Hosted Payments checkout ‘thank you’ page. If a return URL is not specified, the system defaults to the checkout request URL.
All checkouts using an ‘iframe’ present a seamless integration by automatically following the auto-return approach. Returning to a URL on the merchant domain satisfies browser cross-site scripting (XSS) restrictions and allows the merchant to regain control of the frame to collapse it.
Sample Merchant Checkout URLs (POST API)
|Testing API Calls||https://cert-hp.evosnap.com/srv/txn.php|
|Testing Get Shopping Cart URL||https://cert-hp.evosnap.com/srv/checkout/|
|Production API Calls||https://hp.evosnap.com/srv/txn.php|
|Production Get Shopping Cart URL||https://hp.evosnap.com/srv/checkout/|