While setting up your Braintree account with Zoho Books, you should choose the currency that is associated with your merchant account id.
While setting up, you will be asked to enter your merchant ID and merchant account ID. Enter the merchant account ID you wish to include and choose its approriate currency from the Currency drop-down.
If you wish to view your merchant account ids and their associated currency, you can do so by following the steps mentioned below:
and GST filing.