Mr. Reza, besides the two-way flight tickets, the hotel reservation, one completed visa application visa attached with one recent passport photo of each applicant, valid paspsort of each applicant are also required. BTW, the valid Malaysia residence permit are also required. The Chinese embassy in Kuala Lumpur and Chinese consulate in Kuching don't accept visa application by mail. As for the visa fees and payment method, you'd better call the embassy or consulate because the visa fees and payment method have changed but the information about it has not been released on its official website.