# Request signature

> Web3Auth iOS SDK - request | 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.

## Parameters

| Parameter       | Description                                                                                                                                                                                             |
| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `chainConfig`   | Defines the chain to be used for signature.                                                                                                                                                             |
| `method`        | JSON RPC method name in `String`. Currently, the request method only supports the singing 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

```swift
do {
  var params = [Any]()
  // Message to be signed
  params.append("Hello, Web3Auth from iOS!")
  // User's EOA address
  params.append(address)

  // focus-start
  let response = try await web3Auth?.request(
    chainConfig: ChainConfig(
      chainId: "0xaa36a7",
      rpcTarget: "https://eth-sepolia.public.blastapi.io"
    ),
    method: "personal_sign",
    requestParams: params
  )
  // focus-end

  if response!.success {
     print(response!.result!)
   } else {
     // Handle Error
     print(response!.error!)
   }

} catch {
  print(error.localizedDescription)
  // Handle error
}
```

## 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`.    |