The REST API is a powerful tool for programmatically controlling your Text Marketer account. It is the most feature-rich of all our APIs and provides the most detailed information about the success/failure of your requests. This document describes the PHP REST client library, which makes it really easy to use the REST API in your PHP code by just including the provided library file and making the appropriate function calls. For more advanced use of, and errors returned by, the REST API please see the document The Complete Text Marketer RESTful SMS Services API also available from www.textmarketer.co.uk/developers/.