For our European SaaS we had to switch from Paymill to Stripe because a large percentage of US customers would get their cards rejected when paying via Paymill.

For our European SaaS we had to switch from Paymill to Stripe because a large percentage of US customers would get their cards rejected when paying via Paymill. (Paymill is Europe-only, and when a US bank detects a payment going out to Europe, it flags it as fraud. Thanks, US banks!)