How do Chinese developers use it?

Hello, I am a Chinese developer, after comparison, I feel that your products are more in line with my development needs, I hope to learn more about your products. My questions are as follows:

At present, your product is a paid product, so what kind of payment method do I need to use to purchase your product as a developer in China?
Can you issue invoices and vouchers after purchasing your products?

3, If I buy the product, can I use your product user business environment?

4, Do you have a Chinese agent for your products?