This GroupDocs SDK is a PHP library for communicating with the Document Signature Cloud API. It allows developers to work with GroupDocs.Signature Cloud REST APIs in your PHP applications. The Document Signature Cloud API enables developers with the ability to create, verify and search various signature types in multiple documents. Supported file formats include; Word Processing documents, spreadsheets, presentations, PDF, text, rich text, Images, OpenDocument formats and more. GroupDocs provides document manipulation APIs that allows you to view, convert, annotate, compare, sign, assemble and search documents in your applications.