Add Store Credit

Applies any available store credit to a checkout. As on the storefront, all available store credit will be used (up to the value of the order) and no amount need be specified. > #### Note > * Substitute your storefront domain for `yourstore.example.com`. > * The Send a Test Request feature is not currently supported for this endpoint. > * This endpoint runs in the context of an active storefront session and works on any live BigCommerce-hosted storefront, not only in a local environment. It uses [same-origin CORS authentication](/developer/docs/overview/api-fundamentals/api-accounts#same-origin-cors-authentication), and write requests require a CSRF token. Stencil CLI can provide a session and CSRF token for local theme development.