If you have integrated payment systems: what was harder than expected?
For others who have integrated with payment processors/gateways/APIs — what has actually been the hardest part in practice?
A few things I’d love to understand from people who’ve done it:
What ended up being more painful than expected?
What breaks most often in production?
Which providers had the best/worst docs or developer experience and why?
How much operational/support burden exists after launch?
What kinds of edge cases surprised you?
What differentiates a “good” payments integration from a painful one?
Not recruiting or selling anything.