> For the complete documentation index, see [llms.txt](https://docs.coda.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.coda.co/https-coda-payments.gitbook.io-zhong-wen-coda-private-technical-documentation/codapay/hou-duan-api-ji-cheng/direct-card-api-ji-cheng/ru-men-zhi-nan/ru-he-sheng-cheng-jwt-ling-pai.md).

# 如何生成 JWT 令牌

*有关 JWT 令牌的更多详细信息，请点击*[*此处*](https://jwt.io/)*查看。*

JWT（或 JSON Web Token）是一种可以从有效负载生成的令牌，它提供了一种在各方之间安全传输信息的简便方法。

您可以使用 jwt 库（<https://jwt.io/libraries> ）生成一个. 然后，传递一个包含数据编码信息的标头值，以及一个包含您的数据的有效负载。

令牌头部应包含以下信息：

* alg：这是要使用的签名算法。对于您向 Coda 发送的请求，请始终使用**HS256。**
* 类型：这是您要生成的令牌类型。对于您向 Coda 发出的请求，请始终使用“ **JWT** ”。

令牌有效载荷应包含以下信息：

* partner\_id：这是 Coda 提供给您的合作伙伴 ID。
* iat：令牌创建时间（UTC 时区）

请注意，生成的令牌有效期**为 5 分钟**。

*注意：这是用于生成授权的令牌标头，而不是您发送给 Coda 的请求标头。请勿在发送给 Coda 的请求标头中暴露 partnerId。*

#### 例子 <a href="#example" id="example"></a>

**标题：算法和秘密**

```
{
   "alg":"HS256",
   "typ":"JWT",
}
```

**JWT 令牌：有效载荷：数据**

```
{
  "partner_id": "1234567890",
  "iat": 1512203223
}
```

该有效载荷还用于生成 JWT 令牌。

要生成 JWT，您可以先对令牌头和有效负载进行编码，然后从客户端密钥生成签名并将它们组装起来：

```
key = '*yourclientsecret*'

unsignedToken = *encodeBase64Url(header) + '.' + encodeBase64Url(payload)*

signature = *HMAC-SHA256(key, unsignedToken)*

JWT = *unsignedToken + ‘.’ + signature*
```


---

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