My favorite kind of software products are the ones that very clearly make life simpler. Being able to legally sign a document by clicking a button in an email and squiggling my mouse to make my signature is definitely one of those things.
You can provide that to your users with HelloSign! You can set up your documents there (it supports all the formats you’d need, like PDF, Microsoft Word, Powerpoint, etc) and start collecting the signatures you need …
HelloSign: The Industry’s Fastest eSignature API Integration is a post from CSS-Tricks