The EU is not a priority for Stripe, which I think is very unfortunate. They only support a subset of countries. I would have switched from Braintree a long time ago if only Stripe were available in Poland.

Braintree works, but is a source of ongoing cost, as it is impossible to do automatic reconciliation. There is no way to connect the (batched) payouts that you get with transactions/invoices. A major problem in the EU.

Also, Braintree has a terrible risk-review approach, where if you trigger a risk review (for example, by growing), they will freeze your accounts for an indefinite amount of time (from weeks to months) and demand various documents from you.

(I work at Stripe.)

We are actively working on Poland. I would love to learn more about your business and potentially get you early access. Please contact me directly. My email is felix at stripe com

This would be a big deal. Even Shopify haven't got this to work

It's not clear to me why it's so hard. We've built it ourselves, but it's annoying having to redo the logic for smaller projects.