Compatibility with WooCommerce 3.0+

For anyone using this plugin and experiencing incompatibilities with the latest versions of WooCommerce, the problem I got lies in the method add_currency_to_wc. If you haven’t added a custom currency it will return empty array of currencies and break WooCommerce. To fix this change line 120 of the main plugin file woocommerce-custom-currency.php from return; to return $wc_currencies;. Here is the whole method:

	function add_currency_to_wc( $wc_currencies ) {

		// We need to get the array of custom currencies and add it here to woocommerce
		$custom_currencies_data = self::get_custom_currencies();

		if( empty( $custom_currencies_data->labels ) )
			return $wc_currencies;

		for( $i = 0; $i < count( $custom_currencies_data->labels ); $i++ ) {
			$label = empty( $custom_currencies_data->labels[ $i ] ) ? $custom_currencies_data->codes[ $i ] : $custom_currencies_data->labels[ $i ];
			$wc_currencies[ $custom_currencies_data->codes[ $i ] ] = $label;
		}

		return $wc_currencies;

	}