Hi. I buy on Multishop regularly.
The easiest way is PayPal. Just pay, then you get your wallet details. You log in.
Create a cryptocurrency wallet (Exodus is the most convenient, you can exchange cryptocurrency right in the wallet).
Then find any exchanger and exchange money from PayPal for any cryptocurrency. Then, in the wallet itself or using other exchangers (as you like), exchange cryptocurrency several more times. Make sure that at some stage monero and bitcoins are used. All this will confuse the trail and it will be impossible to track the source. After that, calmly exchange the cryptocurrency back for dollars, only this time to your card or bank account.
There are some nuances in working with Multishop. Recently, for unknown reasons, there has been a long wait. I think this is due to the large flow of orders. Be sure to save all payment details so as not to accidentally get into an unpleasant situation. I've heard that there were cases when the order was simply lost and people couldn't get their money back. This didn't happen to me, but just in case, I also now save the data and take a screenshot of the payment.