Learn how to add a digital signature to an Excel workbook using the Aspose.cells Cloud API (v4.0). Includes endpoint, required parameters, authentication flow, error handling, and SDK samples for C#, Java, PHP, Ruby, Node.js, Python, Perl, and Go....command‑line tool to call Aspose.Cells web services. The example...repository for a complete list of Aspose.Cells Cloud SDKs. The following...