nethereum/nethereum/aa-batching-paymasters

dotnet add package Nethereum.Web3
dotnet add package Nethereum.AccountAbstraction

var transfer1 = new TransferFunction { To = "0xRecipient1", Value = Web3.Convert.ToWei(50) };
var transfer2 = new TransferFunction { To = "0xRecipient2", Value = Web3.Convert.ToWei(25) };
 
var receipt = await handler.BatchExecuteAsync<TransferFunction>(transfer1, transfer2);

var approve = new ApproveFunction { Spender = dexAddress, Value = Web3.Convert.ToWei(1000) };
var swap = new SwapFunction { AmountIn = Web3.Convert.ToWei(1000) };
 
var receipt = await handler.BatchExecuteAsync(
    approve.ToBatchCall(),
    swap.ToBatchCall());

var depositCall = new DepositFunction().ToBatchCall(Web3.Convert.ToWei(1));

var receipt = await handler.BatchExecuteAsync(encodedCallData1, encodedCallData2);

using Nethereum.AccountAbstraction.Structs;
using Nethereum.AccountAbstraction.Contracts.Core.NethereumAccount;
 
var accountService = new NethereumAccountService(web3, accountAddress);
 
var calls = new[]
{
    new Call { Target = tokenAddress, Value = 0, Data = approveCallData },
    new Call { Target = dexAddress, Value = 0, Data = swapCallData }
};
 
var receipt = await accountService.ExecuteBatchAsync(calls);

handler.WithPaymaster(paymasterAddress);
// All subsequent operations use this paymaster for gas

handler.WithPaymaster(paymasterAddress, paymasterData);

var paymaster = await web3.GetVerifyingPaymasterAsync(paymasterAddress, paymasterSignerKey);
 
handler.WithPaymaster(new PaymasterConfig(paymasterAddress, async userOp =>
{
    var packed = UserOperationBuilder.PackUserOperation(userOp);
    packed.InitCode ??= Array.Empty<byte>();
    packed.CallData ??= Array.Empty<byte>();
    packed.PaymasterAndData ??= Array.Empty<byte>();
    packed.Signature ??= Array.Empty<byte>();
 
    var sponsorResult = await paymaster.SponsorUserOperationAsync(packed);
    return sponsorResult.PaymasterAndData.Skip(20).ToArray();
}));

var depositPaymaster = await web3.GetDepositPaymasterAsync(paymasterAddress);
await depositPaymaster.DepositForAsync(accountAddress, Web3.Convert.ToWei(0.1m));
 
handler.WithPaymaster(paymasterAddress);

handler.WithPaymaster(new PaymasterConfig(paymasterAddress, async userOp =>
{
    // Call external paymaster API at submission time
    var response = await httpClient.PostAsJsonAsync("https://paymaster.example.com/sign",
        new { userOp });
    var result = await response.Content.ReadFromJsonAsync<PaymasterResponse>();
    return result.PaymasterData.HexToByteArray();
}));