updateCheckout( )

Updates a checkout.

Use this method to update checkout fields such as billing and shipping info, or to add a coupon code or gift card.

To update a checkout's lineItems, completed status, or to remove coupons and gift cards, see these methods:

• Add to Checkout: Add line items to the checkout.
• Update Line Items Quantity: Update the quantity of 1 or more line items in the checkout.
• Remove Line Items: Remove a line item from the checkout.
• Mark Checkout As Completed: To update completed to true if the checkout was completed through a non-Wix orders or payments system.
• Remove Coupon: To remove an applied coupon from the checkout.
• Remove Gift Card: To remove an applied gift card from the checkout.