signNow.Net is a .NET 4.5+ and .NET standard class library for the signNow API. (Official Library)
signNow allows you to embed legally-binding e-signatures into your app, CRM or cloud storage. Send documents for signature directly from your website. Invite multiple signers to finalize contracts....
Mifiel provide a simple and robust RESTful API enabling any service or company operating in Mexico to integrate electronic signatures (using the FIEL) into their workflow.
Through Mifiel’s API, you can easily manage documents and certificates within your Mifiel account