[state_machine]

Stripe has amazing support, even proactively reaching out when weird things happen:

Got a 500 error back from their API once and had an email from one of their engineers in my inbox almost immediately after to find out what happened and resolve it (my http lib was using stale DNS).

[StavrosK]

Hum, maybe I just got unlucky. I'm extremely satisfied with them overall, it's just that the response time could use a bit of improvement.