💡 Transaction Notes.Gas fee is required in the wallet to complete the transaction, Matic is required for Polygon chain, BNB is required for BSC chainDaren's Dapp is to use the Metamask to login and complete the transactionThe first transaction needs to Approve the order system first, subsequent transactions do not need to Approve againThe closed loop of the whole transaction process includes four links: buyer pays → seller submits → buyer checks → seller withdraws coins, so both buyers ...