src/Amadeus/Client/Struct/Pnr/AddMultiElements/Fop.php
public static function isValidFopType($fopType)
    {
        return ($fopType == self::IDENT_CASH
            || $fopType == self::IDENT_CHECK
            || $fopType == self::IDENT_CREDITCARD
            || $fopType == self::IDENT_MISC);
    }
public static function isValidFopType($fopType)
    {
        return ($fopType == self::IDENT_CASH
            || $fopType == self::IDENT_CHECK
            || $fopType == self::IDENT_CREDITCARD
            || $fopType == self::IDENT_MISC);
    }
Check if the given Form Of Payment type is valid

@param string $fopType
@return boolean