Indonesia Currency

You can add a custom currency using the two currency filters ‘mt_currency_symbols’ and ‘mt_currency_codes’.

But, as a warning, adding these currencies only adds them for display and selection; if the payment gateway doesn’t support it, that’s still going to be an issue. Obviously, if you’re only using offline payment, that’s not a problem.

Those filters are now obsolete; you’d want to use just the single filter ‘mt_currencies’. E.g.

add_filter( 'mt_currencies', 'my_currencies', 10, 1 );
function my_currencies( $currencies ) {
    $currencies['CUR'] = array(
        'symbol' => 'symbol',
        'description' => 'Name of currency'
    );
}

‘CUR’ represents the key you want to use for your currency (usually the standard abbreviation, like USD for US dollars).

Doh. I gave you bad code; it didn’t return the array. That should have been:

add_filter( 'mt_currencies', 'my_currencies', 10, 1 );
function my_currencies( $currencies ) {
    $currencies['CUR'] = array(
        'symbol' => 'symbol',
        'description' => 'Name of currency'
    );

    return $currencies;
}