How to deal with frequent proofing by customers?

First, about the internal problems of proofing: I've been proofing several times, which is a bit difficult. Next time, you can ask the customer to transfer the money to your personal account, and then you can give the money to the relevant personnel in the workshop to work overtime. I made it myself! Workshop workers do your work mainly because they don't have the money to take it and waste time, or you invite them to dinner and put in a good word for yourself. Second, regarding the customer problem, you should collect more customer information and judge whether the customer has the possibility of buying in bulk. If this is just a scientific experiment, then you are a big loser. Personally, I feel that this customer is unwilling to communicate with you more, and I am still a little skeptical.