Someone ( a buyer ) just asked me to work for him without placing his order as he is saying that he has a payment problem right now. And he also made a commitment that after a few days of the work done he will pay me through a custom offer. Now should I do the work or not? And if I do such kind of work for anyone without his/her order then will it be legal and create any problem for me in future? Please give me the legal suggestion on this issue.