# Request signature

> Web3Auth Flutter SDK - request Function | Embedded Wallets

The `request` method facilitates the use of prebuilt transaction screens for signing transactions. The method will return [SignResponse](#signresponse). It can be used to sign transactions for any EVM chain and screens can be customized to match your branding.

Please check the list of [JSON RPC methods](https://docs.metamask.io/wallet/reference/json-rpc-api/), noting that the request method currently supports only the signing methods.

## Arguments

| Arguments       | Description                                                                                                                                                                                            |
| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `chainConfig`   | Defines the chain to be used for signature.                                                                                                                                                            |
| `method`        | JSON RPC method name in `String`. Currently, the request method only supports the signing methods.                                                                                                     |
| `requestParams` | Parameters for the corresponding method. The parameters should be in the list and correct sequence. Take a look at [RPC methods](https://docs.metamask.io/wallet/reference/json-rpc-api) to know more. |

## Usage

```dart title="Usage"

try {
  List<dynamic> params = [];
  // Message to be signed
  params.add("Hello, Web3Auth from Flutter!");
  // User's EOA address
  params.add("<User Address in Hex>");

  // focus-start
  final response = await Web3AuthFlutter.request(
    ChainConfig(
      chainId: "0x1",
      rpcTarget: "https://mainnet.infura.io/v3/$key",
    ),
    "personal_sign",
    params,
  );

  log(response.toString());
  // focus-end
} on UserCancelledException {
  log("User cancelled.");
} catch(e) {
  log("Unknown exception occurred");
}
```

## SignResponse

| Name      | Description                                                   |
| --------- | ------------------------------------------------------------- |
| `success` | Determines whether the request was successful or not.         |
| `result?` | Holds the signature for the request when `success` is `true`. |
| `error?`  | Holds the error for the request when `success` is `false`.    |