Ready! You are connected to Binance Smart Chain main network. Now let's add TONCOIN to your MetaMask. Go to https://ton.org/coin and copy the address of the wrapped Toncoin.
Open your wallet and click "+Add tokens"
Paste the address and tap "Add token".
That's it! Now the TONCOIN balance is in your wallet, so you can pay with the wrapped Toncoin in BSC using MetaMask!