/**
  * Push a transaction currency the data array
  *
  * @since 1.0.0
  *
  * @param string $code ISO 4217 format currency code e.g. EUR
  *
  * @return void
  */
 public static function pushTransactionCurrency($code)
 {
     self::$currency = $code;
     self::$data['ecommerce']['currencyCode'] = $code;
 }