Document Automation APIs along with open-source SDKs to enhance Java, Python, Node.js, C# .NET, Ruby, C++, and PHP applications to view, edit, annotate, convert, compare, e-sign, parse, split, merge, Extract, redact, watermark, metadata, paraphrase, classify, repair, and translate documents of almost all the popular file formats....developer, you can easily annotate any of your PDF document programmatically...will be focusing on how to annotate PDF documents using a REST...