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I want to generate a simple transaction from a Smart Wallet (Account Abstraction - ERC4337) but I also want to pay for gas fees on behalf of the user.

By looking at the UserOperation struct...

struct UserOperation {
    address sender;
    uint256 nonce;
    bytes initCode;
    bytes callData;
    uint256 callGasLimit;
    uint256 verificationGasLimit;
    uint256 preVerificationGas;
    uint256 maxFeePerGas;
    uint256 maxPriorityFeePerGas;
    bytes paymasterAndData;
    bytes signature;
}

...I understand that I have to set paymasterAndData up in order to be able to sponsor transactions. How can I do that when I create the UserOperation using ethers?

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