How can we show the payment proof from paypal account where we received payment?

You could try taking a snapshot of the page where there is a proof that your account has been credited with that much amount of money. To take the snapshot, just press the Print Screen of your keyboard and then press ctrl+c. Now go to MSPAINT and there press ctrl+v. Now, once the image is pasted there put a black spot on the details you want to hide. And i think that you would know how to do that.. Then just upload that photo as a proof.