Generate Cart and Checkout URL for Quote
Generates a cart URL and a checkout URL for a specific quote based on the provided `quote_id`. Cart and checkout URLs can only be generated for quotes that are in the Open status.
This endpoint will generate a checkout link for a quote even if it is configured to hide the checkout button on the Buyer Portal. You can use this to create an alternate checkout flow for your sales quotes.
Equivalent Storefront GraphQL API Mutation: `quoteCheckout`.