The Snippets API lets you manage snippets that add custom functionality to Square Online sites. A snippet is HTML, CSS, and JavaScript that is injected into the head element of all pages on a site, except for checkout pages. You can use the Snippets API to create applications that help meet the many needs of Square sellers.
Note: Square Online APIs are publicly available as part of an early access program. For more information, see Early access program for Square Online APIs.
For more information, see the following guide: