i want to sell 1000 $ papypal my cash for BTC pm me ......
For these types of deals you're going to want to post a picture of the receipt that proves you paid with cash.
In the future, if you want to buy BTC easier, you're going to have to keep your options open. Don't lock yourself into paying with a single payment type and assuming you'll be able to buy BTC with it. Stay liquid in
cash, so you can ingratiate the seller by going with the form of payment he prefers.