The Squarelink Webhooks API allows you to receive updates about user transactions. This requires that you set the Webhooks Callback URL in your registered token's settings in the Developer Console. Squarelink will send a POST request to the specified Callback URL with information about a transaction once it's confirmed. The data returned in the callback complies with the Transaction Model that is defined in the API Reference. Squarelink is an access tool for blockchain applications and services that allows users to securely recover private keys. It provides a way for users to sign up, sign in, and sign transactions, using an email and password without a server ever touching a private key.