When these services first came out there were lots of technical hurdles to overcome re: web based PDF signing, but it's pretty straightforward to do nowadays.

When these services first came out there were lots of technical hurdles to overcome re: web based PDF signing, but it's pretty straightforward to do nowadays. I had our co-op built an open-source esignature API, that produces audit logs and has a similar user flow to electronic signature provides like Docusign, Hellosign, Adobe sign, etc.... It took him a little over 2 months to get everything working. Only real difficulty he ran into was scaling and stamping signatures on the PDF, as there wasn't a singly Python PDF library that had all the necessary features. In the end he got it figured out though - for anyone interested / looking to implement eSignatures in their app, see https://github.com/this-is-ari/libresign https://github.com/this-is-ari/libresign - it's MIT licensed.