add unsupported paypal currency to woocommerce and woocommerce subscriptions

add-to-functions-1.php

<?php
/**
 * this code will add an unsupported currency to Woocommerce
 * it will convert any amounts including those for a subscription product into a supported currency (in this case USD)
 * paypal HTML variables can be found at https://developer.paypal.com/webapps/developer/docs/classic/paypal-payments-standard/integration-guide/Appx_websitestandard_htmlvariables/#id08A6HI00JQU
 * payment processing can then be done via Paypal
 * this example uses the UAE Dirham (or AED)
 * note - any orders placed this way are automatically placed on-hold by Woocommerce due to an amount mismatch and MUST be manually updated to processing or complete, esp with virtual or downloadable orders.
 * 
 * 9 April 2018: updated currency converter as Google stopped working
*/
 
/*Step 1 Code to use AED currency to display Dirhams in WooCommerce:*/
add_filter( 'woocommerce_currencies', 'add_aed_currency' );  
function add_aed_currency( $currencies ) {  
	$currencies['AED'] = __( 'UAE Dirham', 'woocommerce' );  
	return $currencies;  
}

/*Step 2 Code to add AED currency symbol in WooCommerce:*/
add_filter('woocommerce_currency_symbol', 'add_aed_currency_symbol', 10, 2);  
function add_aed_currency_symbol( $currency_symbol, $currency ) {  
	switch( $currency ) {  
		case 'AED': $currency_symbol = 'AED'; break;  
	}  
	return $currency_symbol;  
}  
add_filter( 'woocommerce_paypal_supported_currencies', 'add_aed_paypal_valid_currency' );       
function add_aed_paypal_valid_currency( $currencies ) {    
	array_push ( $currencies , 'AED' );  
	return $currencies;    
}   

/*Step 3 – Code to change 'AED' currency to ‘USD’ before checking out with Paypal through WooCommerce:*/
add_filter('woocommerce_paypal_args', 'convert_aed_to_usd', 11 );  
function get_currency($from, $to){
	$from = "USD";
        $to = "AED";
		
        // create curl resource 
        $ch = curl_init(); 

        // set url 
        curl_setopt($ch, CURLOPT_URL, "https://free.currencyconverterapi.com/api/v5/convert?q={$from}_{$to}&compact=ultra"); 

        //return the transfer as a string 
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

        // $output contains the output string 
        $output = curl_exec($ch);
        // close curl resource to free up system resources 
        curl_close($ch); 
		$data = explode(':', $output);
		$data = explode(" ", $data[1]);
		$amnt = round($data[0], 2);
		return $amnt;
}
function convert_aed_to_usd($paypal_args) {
	if ( $paypal_args['currency_code'] == 'AED') {  
		$convert_rate = get_currency(); //Set converting rate
		$paypal_args['currency_code'] = 'USD'; //change AED to USD  
		$i = 1;  
        
		while (isset($paypal_args['amount_' . $i])) {  
			$paypal_args['amount_' . $i] = round( $paypal_args['amount_' . $i] / $convert_rate, 2);
			++$i;  
		}  

		if ( $paypal_args['shipping_1'] > 0 ) {
			$paypal_args['shipping_1'] = round( $paypal_args['shipping_1'] / $convert_rate, 2);
		}
		
		if ( $paypal_args['discount_amount_cart'] > 0 ) {
			$paypal_args['discount_amount_cart'] = round( $paypal_args['discount_amount_cart'] / $convert_rate, 2);
		}

		if ( $paypal_args['tax_cart'] > 0 ) {
			$paypal_args['tax_cart'] = round( $paypal_args['tax_cart'] / $convert_rate, 2);
		}

		if (isset($paypal_args['a1'])) { 
			$paypal_args['a1'] = round( $paypal_args['a1'] / $convert_rate, 2);
			$paypal_args['currency_code'] = USD;
		} 		

		if (isset($paypal_args['a2'])) { 
			$paypal_args['a2'] = round( $paypal_args['a2'] / $convert_rate, 2);
			$paypal_args['currency_code'] = USD;
		} 		

		if (isset($paypal_args['a3'])) { 
			$paypal_args['a3'] = round( $paypal_args['a3'] / $convert_rate, 2);
			$paypal_args['currency_code'] = USD;
		} 	
	}
return $paypal_args;  
}   

You made my day !
Thanks a lot :-)