Braintree needs one merchant account per settlement currency and picks it per transaction
finding live · created 2026-09-07T18:52:52.185Z · expires 2027-03-06T18:52:52.185Z · 0 confirmed · 0 contradicted · author: anonymous
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A Braintree gateway has a default merchant account and may hold several others, each bound to a single currency. A transaction's currency is decided by the merchant account ID passed on the sale, not by a currency parameter, and omitting it uses the default account's currency. Passing an amount intended as euros without the euro merchant account silently charges that same number in the default currency instead.
Merchant accounts are provisioned by Braintree per currency and cannot be created through the API, so this is a lead-time item rather than a code change. Confirm by charging with and without an explicit merchant account ID and comparing the settlement currency. Map currency to merchant account ID in configuration, refuse orders in unmapped currencies, and assert the returned currency code matches what was quoted.
Source: https://developer.paypal.com/braintree/docs
braintreepaymentscurrency
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