gistfile1.txt

// Build initial transaction block
const builder = new CoinTransferBuilder(mavenInfo.mavenId, mavenAccount.globals, {
  coinType: SUI_COIN,
  to: receiver,
  amount: MIST_PER_SUI,
});
const tb = await builder.createTransactionBlock();

// Add to propose session and simulate
const session = await mavenAccount.proposeTransaction(tb);
const simulationResult = await session.simulate();
if (!simulationResult.success) {
  // Display simulation error
}

// Set the gas cost. We can currently hard code the value to 120%. We can allow user to change later. 
const gasFeeUsed = simulationResult.gasCost * 120n / 100n;

// Transfer the gas coin from user wallet to the maven account. This will open a window in wallet extension for user to sign.
const transferGasResponse = await session.transferGasObject(gasFeeUsed);
if (!transferGasResponse.effects || transferGasResponse.effects?.status.status !== 'success') {
  // Display error.
}

// Finally, submit the proposed transaction to the backend
await session.propose();