Stripe (and its competitors) solves exactly what you need. It takes 1 or 2 days to integrate into your app [1] and you more or less never have to deal with it

Stripe (and its competitors) solves exactly what you need. It takes 1 or 2 days to integrate into your app [1] and you more or less never have to deal with it again (i.e. very low maintenance/administration). I also think it's worth learning just to have an understanding of how online payment works. -- [1]: 1 day for a basic subscription model, with granting or removing access when the payment succeeded or failed or the period is over and a new payment hasn't been done. Maybe 2 days if you want to handle different plans (e.g. free, basic, pro) giving access to different features, and also like a 14 days free trial.