Is there any downside (other than a little more work for the implementer) to just using their main payment processing API, and to implement subscription billing with a cronjob? This is what sr.ht does [1], at least as of a year ago. If doing it manually now means saving a bunch of money, seems like a no-brainer. [1] https://cmpwn.com/@sir/103074952842876982
But for full disclosure, my latest project just bit the bullet and accepted the extra 0.5%. Wanted to see how it goes. Could always switch if I found the need.