Hi Mike,
Please take a look for the docs of previous paid plugin in Woothemes.
Search “Merchant Account IDs”:
https://docs.woocommerce.com/document/braintree/
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Merchant Account IDs
This section is only needed if you have different merchant accounts for multicurrency support. Please note that you must use a currency switcher plugin to change currencies — we recommend the Aelia Currency Switcher (requires purchase), which works seamlessly with this Braintree plugin.
WooCommerce Braintree Credit Card Settings 3
The different merchant IDs you’ve entered here will then be used to charge the appropriate currency. To add more merchant IDs:
Select the currency for this merchant ID in the dropdown.
Click the “Add merchant account ID for (currency)” button.
Enter the merchant account ID for this currency in the newly created field.
Repeat as needed for each merchant ID / currency.
Remember, you need a new merchant account for each currency.
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Is it clear enough?