Add Currency Symbol for Give Plugin

functions.php

add_filter( 'give_currencies', 'give_custom_currencies' );

function give_custom_currencies( $currencies ) {
	$currencies['NGN'] = __( 'Nigerian Naira (₦)', 'bethlehem' );

	return $currencies;
}

add_filter( 'give_currency_symbol', 'give_custom_currency_symbol', 10, 2 );

function give_custom_currency_symbol( $symbol, $currency ) {
	if( $currency == 'NGN' ) {
		$symbol = '₦';
	}

	return $symbol;
}