Update Code

README.md

@@ -38,11 +38,14 @@ For the deploy tutorial of AUA, please refer to [How to deploy AUA](/deploy.md).
 + [data/playdata](/data/playdata.md)
 + [data/density](/data/density.md)
 + [data/challenge](/data/challenge.md) [^2]
++ [data/cert](/data/cert.md) [^3]
 
 [^1]: The `assets/preview` API is not available for release version of AUA. It is provided by [AffPreview](https://github.com/Arcaea-Infinity/Aff2Preview).
 
 [^2]: The `data/challenge` API is not available for release version of AUA.
 
+[^3]: The `data/cert` API is not available for release version of AUA.
+
 ### Error status
 
 | status | description                                               |

data/cert.md

@@ -0,0 +1,19 @@
+## data/cert
+
+#### Example
+
++ `{apiurl}/botarcapi/data/cert`
+
+##### Return data (Edited for readability)
+
+```json5
+{
+  "status": 0,
+  "content": {
+    "entry": "join/21",
+    "version": "4.1.4c",
+    "cert": "HERE IS THE CERT", // the base64 encoded cert
+    "password": "HelloWorld"
+  }
+}
+```