回复：回复：回复：请问8老师: 律师办完I-140后应该给正式收据吗？

Yes. I mean the payment to the lawyer for service fee. But the lawyer refuse to give. He said there is no receipt to issue. "credit card payment sign sheet" with my signature only can be the proof of payment.

-If you paid it by credit card, then your credit card statement can be the proof also. Normally, the lawyer will not ask you to pay it again. So, yopu may not need to worry about it.