[system2]

I am using Stripe with a self-hosted CRM software I bought (slightly modified for other reasons, but not the payment module.)

Stripe alone can take care of it. Subscription or any type of recurring invoice system would be sufficient enough to stop collecting the check. Although, it comes with nearly 3% fee, which is fine because I see it as "what if I couldn't collect one of these invoices". That 3% really doesn't hurt much at the end of the year as long as you collected 100% of your invoices. Missing 2-3 invoices can truly hurt though.