And the thing about their tech stack is its old..but absolutely workable. They have examples in pretty much every language, decent documentation, and support. And they are very slow to sunset things because their customers are slow moving traditional businesses. So code you write for a customer may work without tweaking for 4, 5, or even 10 years.
In my case, 20 years. No change in API calls in that time.
Very few errors, except in the early days. I hate them because of the complexity of the solution (I needed a relationship with a separate "payment processor" that has changed names/systems/owners five times in those 20 years) but I have had few problems with withholding etc.
But my monthly charges and individual charges are very consistent, and chargeback rate very low (but not zero).
