Amazon payments apparently does: https://pay.amazon.com/help/201212280

> If a refund takes place, you will also be refunded the following transaction fees:

> - The domestic processing fee (for example, the 2.9% fee)

> - The cross-border processing fee (for example, the 3.9% fee)

> Note that the Authorization fee and Disputed chargeback fee are non-refundable.

So it looks like Amazon Payments holds onto the 30 cents but refunds the variable part. It's obviously not zero, but for a $100 domestic charge Amazon's 30 cents is much less than the $29.30 that Stripe pockets.

> $29.30

God I hope the decimal is just in the wrong place there

It is, but as they also added the extra 0, it indicates they were actually out by a factor of 10 in their math, it wasn't just a typo.

> but for a $100 domestic charge Amazon's 30 cents is much less than the $29.30 that Stripe pockets

Is this true?

No, it'd be $3.20. 2.9% + $0.30/transaction.

$2.90 + $0.30, you mean?

Braintree only takes the $0.30 and refunds the percentage.