diff --git a/README.md b/README.md
index 3b13531..c0c9d94 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,24 @@ Grasscutter Authentication System
 - Place jar inside plugins folder of Grasscutter.
 - To change hash algorithm change `Hash` in config.json inside plugins/GCAuth (Only Bcrypt and Scrypt is supported)
 - To enable/disable plugin change `Enable` config.json inside plugins/GCAuth (enabled by default)
+- All payload must be send with `application/json` and Compact JSON format ( without unnecessary spaces )
+- Auth endpoint is:
+  - Check auth status : `/grasscutter/auth_status` (GET)
+  - Register: `/grasscutter/register` (POST) <br>payload : `{"username":"username","password":"password","password_confirmation":"password_confirmation"}`
+  - Login: `/grasscutter/login` (POST) <br>payload : `{"username":"username","password":"password"}`
+  - Change password: `/grasscutter/change_password` (POST) <br>payload : `{"username":"username","new_password":"new_password","new_password_confirmation":"new_password_confirmation","old_password":"old_password"}`
+- Response is `JSON` with following keys:
+  - `status` : `success` or `error`
+  - `message` : `success` or `error` message :
+    - AUTH_ENABLED : Plugin is enabled
+    - AUTH_DISABLED : Plugin is disabled
+    - EMPTY_BODY : No data was sent with the request
+    - USERNAME_TAKEN : Username is already taken
+    - PASSWORD_MISMATCH : Password does not match
+    - UNKNOWN : Unknown error
+    - INVALID_ACCOUNT : Username or password is invalid
+    - NO_PASSWORD : Password is not set, please set password first by resetting it (change password)
+  - `jwt` : JWT token if success with body :
+    - `token` : Token used for authentication, paste it in username field of client.
+    - `username` : Username of the user.
+    - `uid` : UID of the user.
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