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The PDFfiller API allows users to build applications that interact with PDFfiller over HTTP REST methods. Integrate the SendToSign API into your app or software platform to optimize your signature collection and document management workflow. Send, manage, and track all of your signed documents automatically and organize your signature requests and signed documents. PDFfiller provides paperless document management to find, edit, save, print, eFax, eSign, share and complete, any document conveniently from any device.