While, in general, we would recommend deploying your smart contracts via the Builder, we recognize that there are some use cases where deploying a smart contract from Unity (or a Made-With-Unity application) is useful. Contract deployment involves sending a transaction, which is done via an asynchronous Task. You can use await when calling SequenceWallet.DeployContract from within an async Task if you wish to obtain the ContractDeploymentReturn object directly. Or, you can take the recommended approach which is to setup handler functions for the SequenceWallet.OnDeployContractComplete and SequenceWallet.OnDeployContractFailed events and call the SequenceWallet.DeployContract method from anywhere (without await). SequenceWallet.DeployContract is essentially a wrapper for a very special SequenceWallet.SendTransaction call and therefore, you can expect to still receive the SequenceWallet.OnSendTransactionComplete or SequenceWallet.OnSendTransactionFailed events in addition. 
public void OnDeployContractCompleteHandler(SuccessfulContractDeploymentReturn result) {
    Address newlyDeployedContractAddress = result.DeployedContractAddress;

    // Do something
}

public void OnDeployContractFailedHandler(FailedContractDeploymentReturn result) {
    // Do something
}

public void OnWalletCreatedHander(SequenceWallet wallet) {
    wallet.OnDeployContractComplete += OnDeployContractCompleteHandler;
    wallet.OnDeployContractFailed += OnDeployContractFailedHandler;
}
If you’re unfamiliar with working with events in Unity, check out this great Reddit post! To deploy a contract you’ll need to first compile your smart contract code into bytecode and add the bytecode as a hexadecimal string in one of your C# scripts. To deploy a smart contract, you can use this code snippet: 
string bytecode = "Here you'll paste your compiled bytecode"
_wallet.DeployContract(Chain.Polygon, bytecode);