Six and a half years ago I launched https://www.masteringmodernpayments.com/ https://www.masteringmodernpayments.com/, a book to teach people how to integrate S

Six and a half years ago I launched https://www.masteringmodernpayments.com/ https://www.masteringmodernpayments.com/, a book to teach people how to integrate Stripe with their Rails app. It generated almost $80k of revenue, mostly front loaded but with a really long tail. Recently I turned off sales because I was feeling more and more guilty about not having time to update it, and now that I work for Stripe updating it involves a layer of approval. Of course, now I work for Stripe so I'd say it was a success :)