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I am trying to find an api, that enables me to sign documents using Xamarin app. All the apis that I see online asks me to upload the document on their servers. For example, docusign allows me to upload document to a server, and then provide REST services, or Webhooks to access them in the app.

Problem is I can't upload documents anywhere or rather can never get approval to upload them online. So, other than creating my own implementation of e-signature, I will have to find an api, which can work without any document upload.

Is there an api that can do it? Basically if I send the image of signature and document id to it, it can create a e-signature based on that? Or maybe an api that allows access the way we access gallery or contacts in Android or how third party payment system works?

  • To be clear, do you mean a cryptographic signature, or an image of a handwritten signature? – Kodiologist Oct 10 '17 at 18:51
  • I mean a handwritten signature, like used at amazon delivery. – jitendragarg Oct 12 '17 at 9:26
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    So, rather than an API, could you use a program or library for PDF manipulation, such as pdftk, to overlay a signature image onto the document? – Kodiologist Oct 12 '17 at 14:23
  • But that will not be legally binding. Otherwise, I was planning on just that. – jitendragarg Oct 13 '17 at 15:59
  • I don't understand how using a program running on somebody else's computer (via an Internet API) would make the signature legally binding, whereas running the program on your own computer wouldn't. Perhaps you should be talking to law.stackexchange.com. – Kodiologist Oct 13 '17 at 16:05

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