In fact I not need any service or payment gateway, just need the custemers can select payment way: on bank account or pay cash to postman. I need see what customer selected on order. If select payment over bank should wait bank confirmation, after that organize shipping. If select pay cash to postman, I will organize shipping without waiting, regarding courier service will get cash when goods deliver, ad this cash will pay on our bank account.
It is mean not need any service, just selection payment way, this determines the delivery method.