Returns a collection of MerchantAccount objects.

Node.js
var gateway = braintree.connect({
  environment: braintree.Environment.Sandbox;
  merchantId: 'MERCHANT_ID',
  publicKey: 'PUBLIC_KEY',
  privateKey: 'PRIVATE_KEY'
});

gateway.merchantAccount.all(function (err, merchantAccounts) {
  merchantAccounts.forEach(function (merchantAccount) {
    console.log(merchantAccount.currencyIsoCode);
  });
});