Problems with the customer?

Question

Freelance

Recently, our bet was accepted on the upwork. We need to design an online store. But the customer asked to continue communication in the cart. And so we discussed the price, he threw it out, etc. Next, I asked him to continue communicating in the upwork and pay there for our common security. He said that he was going to pay with Bitcoins, and that there was no such function in the upwork.
How to do everything safely?

Answer 1

How to do everything safely?

Through Upwork. Otherwise, a potential ban.

Answer 2

Inform the customer that you work only with freely convertible currencies.

Answer 3

Through upwork otherwise breaking the rules

Answer 4

Bitcoin? Lol, straight up scammer.

Answer 5

With this, no way. Once the cue ball means it is pinched in the gray zone. If it pinches, then the store will be for trading snus or CPU. Even if a miracle suddenly happens and he still pays for the work, the cue balls still need to be withdrawn :)
To his sky, for an asterisk :) send ...

Answer 6

Banned on upwork for cue ball.