# Message Signature

### 1. Request.signMessage <a href="#id-1.-request.signmessage" id="id-1.-request.signmessage"></a>

**Parameters**

<table><thead><tr><th width="183">Name</th><th width="178.33333333333331">Type</th><th>Description</th></tr></thead><tbody><tr><td>chainId</td><td>number</td><td>Chain ID of the particular network</td></tr><tr><td>appName</td><td>string</td><td>Name that will appear in FAVORLET app when signing a message</td></tr><tr><td>from</td><td>string</td><td>Wallet address to sign a message</td></tr><tr><td>message</td><td>string</td><td>message to sign</td></tr></tbody></table>

**Response**

<table><thead><tr><th width="185.33333333333331">Name</th><th width="180">Type</th><th>Description</th></tr></thead><tbody><tr><td>requestId</td><td>string</td><td>ID to track the requested operation or transaction</td></tr><tr><td>expiredAt</td><td>number</td><td>The amount of time (in seconds) that an operation or transaction request expires.</td></tr></tbody></table>

**Example**

```javascript
import { Request } from "favorlet.js";

const response = await Request.signMessage({
  chainId: 8217, // 해당 체인 id
  appName: "BlockChainApp", // FAVORLET 앱에 노출
  from: "0x{address in hex}", // 서명할 지갑 주소
  message: "서명할 메세지", // 서명할 메세지
});

console.log(response);
/*
{
  requestId: "c8393195-b49d-4586-b3fd-0e1a1e94f189",
  expiredAt: 1667891117,
}
*/
```

### 2. createDeepLink <a href="#id-2.-createdeeplink" id="id-2.-createdeeplink"></a>

**Parameters**

<table><thead><tr><th width="185">Type</th><th>Description</th></tr></thead><tbody><tr><td>string</td><td>requestId received when requesting</td></tr></tbody></table>

**Response**

<table><thead><tr><th width="186">Type</th><th>Description</th></tr></thead><tbody><tr><td>string</td><td>DeepLink to the request page within the FAVORLET app</td></tr></tbody></table>

**Example**

```javascript
import { createDeepLink } from "favorlet.js";

const deepLink = createDeepLink(response.requestId); // Request를 통해 받은 requestId

/*
- PC: 생성된 deepLink를 qrcode 라이브러리를 이용하여 QR 생성 후 스마트폰으로 스캔
- Mobile: window.location.href 등을 사용하여 생성된 deepLink로 직접 이동
*/
console.log(deepLink);
// https://app.favorlet.link/?requestId=c8393195-b49d-4586-b3fd-0e1a1e94f189
```

### 3. receipt <a href="#id-3.-receipt" id="id-3.-receipt"></a>

```javascript
import { receipt } from "favorlet.js";

const result = await receipt(response.requestId); // Request를 통해 받은 requestId

console.log(result);
/*
- status에 따라 이후 분기 처리

### requested
{
  requestId: "c8393195-b49d-4586-b3fd-0e1a1e94f189",
  expiredAt: 1667891117,
  action: "signMessage",
  signMessage: {
    status: "requested"
  }
}

### canceled
{
  requestId: "c8393195-b49d-4586-b3fd-0e1a1e94f189",
  expiredAt: 1667891117,
  action: "signMessage",
  signMessage: {
    status: "canceled",
    signature: null,
    errorMessage: null
  }
}

### succeed
{
  requestId: "c8393195-b49d-4586-b3fd-0e1a1e94f189",
  expiredAt: 1667891117,
  action: "signMessage",
  signMessage: {
    status: "succeed",
    signature: "c308c6bc851cdaf8a125b2990753f376e3660f9f98a4c515de9e8c0fbd98f2cf3db519a7ba4dab78d001232b6f55b24896a57e3264cafe3dda78a89ecfb0bb141b",
    errorMessage: null
  }
}
*/
```


---

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```
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