How to add MXN currency in paypal

Edit /amember/plugins/payment/paypal_r/paypal_r.inc.php and change this:

Code:

        add_product_field('paypal_currency',
            'PayPal Currency',
            'select',
            'valid only for PayPal processing.<br /> You should not change it<br /> if you use 
            another payment processors',
            '',
            array('options' => array(
                '' => 'USD',
                'GBP' => 'GBP',
                'EUR' => 'EUR',
                'CAD' => 'CAD',
                'AUD' => 'AUD',
                'JPY' => 'JPY'
            ))
            );

to

Code:

        add_product_field('paypal_currency',
            'PayPal Currency',
            'select',
            'valid only for PayPal processing.<br /> You should not change it<br /> if you use 
            another payment processors',
            '',
            array('options' => array(
                '' => 'USD',
                'GBP' => 'GBP',
                'EUR' => 'EUR',
                'CAD' => 'CAD',
                'AUD' => 'AUD',
                'JPY' => 'JPY',
                'MXN' => 'MXN'
            ))
            );