越南采购需求：网球发球机、羽毛球发球机、篮球发球机、足球发球机、橄榄球发球机、壁球发球机

I'm interested in placing an order for remote controls suitable for a specific tennis product. Can you provide me with the details on how to proceed with the order? Additionally, I would like to know about the payment options you accept and the estimated shipping time to Vietnam. Could you also inform me about the minimum order quantity and any discounts available for bulk purchases? Understanding your delivery process would be appreciated, especially concerning customs handling and potential additional costs related to shipping. Looking forward to your prompt response!