Building vs. Buying an eSignature API
hellosign.com
hellosign.com
Just like stripe, offering a service with a developer friendly API-first approach is great and I happily pay for someone else to be the domain expert.
Sucks when services go down or are complete black boxes but I've been using HelloSign for several years as a consumer and it's always been fantastic. This was a neat article and I'll be sure to use them the next time I need to integrate signing in an app.