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CardCorp merchant accounts only
The custom checkout functionality is for CardCorp merchant accounts only. It is not available for Stripe merchant accounts.

You can create a custom checkout as part of the request to create an order.

The request returns the checkout ID, and then you can use it as part of the payment iframe.

After you create a custom checkout, if the customer does not complete the transaction within 25 minutes, the checkout expires. Renew the checkout using the Renew checkout request described in this section.

For an overview of the integration with the custom checkout, see Integrate with custom checkout and payment iframe.

You can also obtain the results of the transaction from the payment gateway webhook. See Payment gateway webhook.

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Built-in checkout
If you use the BillPro built-in checkout, when the user clicks on the payment link to open the checkout, the checkout automatically renews.
You can use the BillPro built-in checkout if you Integrate with payment links.
For a full description of the checkout, see Secure checkout and Payment links and iframe checkouts.