Braintree\MerchantAccountGateway::_verifyGatewayResponse PHP Method

    private function _verifyGatewayResponse($response)
    {
        if (isset($response['response'])) {
            $response = $response['response'];
        }
        if (isset($response['merchantAccount'])) {
            // return a populated instance of merchantAccount
            return new Result\Successful(MerchantAccount::factory($response['merchantAccount']));
        } else {
            if (isset($response['apiErrorResponse'])) {
                return new Result\Error($response['apiErrorResponse']);
            } else {
                throw new Exception\Unexpected("Expected merchant account or apiErrorResponse");
            }
        }
    }