Checkout Session Object

Checkout session ID.

URL of the Wix-hosted checkout page where the buyer completes payment. The buyer enters the page as an anonymous shopper, and any session held by the calling app isn't carried over.

The URL carries query parameters Wix needs to render the page correctly (for example, a successUrl parameter derived from callbackUrls.thankYouPageUrl). Pass the URL through to the buyer unchanged. Don't strip, reorder, rewrite, or otherwise mutate its query string.