/**
 * Converts an amount from one currency to another, using the Aelia Currency
 * Switcher.
 *
 * @param double amount The amount to convert.
 * @param string to_currency The target currency.
 * @param string from_currency The source currency.
 * @return double
 */
function aelia_convert_amount_to_currency($amount, $to_currency, $from_currency) {
  // Call the currency conversion filter. 
  return apply_filters('wc_aelia_cs_convert', $amount, $from_currency, $to_currency);
}

/**
 * Converts the payments passed to Payeezy to USD.
 *
 * @param array request_data The data used for a payment request.
 * @param object A paument request instance.
 * @return array The payment data, with the amount in USD.
 * @author Aelia
 * @link https://bit.ly/aelia_codeable
 */
add_filter( 'wc_first_data_payeezy_gateway_request_data', function($request_data, $payment_request) {
  if(strtoupper($request_data['currency_code']) != 'USD') {
    $request_data['amount'] = round(aelia_convert_amount_to_currency($request_data['amount'], 'USD', $request_data['currency_code']), 2);
  }
  return $request_data;
}, 10, 2);