diff --git a/README.md b/README.md
index 9411a3c..7d59d51 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,14 @@ htwkalender-demo
 
 Execute the following api calls to fetch data manually from HTWK and store it in the database:
 
+Both api calls need a token to be executed.
+You can get a token by logging in to the admin ui and copy the token from the local storage.
+Add this attribute to the request header of the api call:
+
+```
+Authorization : eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE3MDE3MDA3ODQsImlkIjoicnA0Ym54YXNyczM5emR4IiwidHlwZSI6ImFkbWluIn0.j7Bt3-uaZ8CoNt8D9Oxjk7ZwvHDGZJy1xe3aq4BID3w
+```
+
 The first command will fetch all groups and store them in the database.
 This should be done quick in a few seconds (0-5s).
 When you execute the command again, it will update the groups in the 
diff --git a/backend/openapi.yml b/backend/openapi.yml
index 7f51ae3..69af1c5 100644
--- a/backend/openapi.yml
+++ b/backend/openapi.yml
@@ -11,30 +11,150 @@ paths:
   /api/fetchPlans:
     get:
       summary: Fetch Seminar Plans
+      security:
+        - ApiKeyAuth: []
       responses:
         '200':
           description: Successful response
   /api/fetchGroups:
     get:
       summary: Fetch Seminar Groups
+      security:
+        - ApiKeyAuth: []
       responses:
         '200':
           description: Successful response
+  /api/modules:
+    delete:
+        summary: Delete Module
+        security:
+            - ApiKeyAuth: []
+        responses:
+          '200':
+            description: Successful response
   /api/rooms:
     get:
       summary: Get Rooms
       responses:
         '200':
           description: Successful response
-  /api/feedURL:
+  /api/schedule/day:
     get:
-      summary: Get iCal Feed URL
+      summary: Get Day Schedule
+      parameters:
+        - name: room
+          in: query
+          description: room
+          example: "LN006-H"
+          required: true
+          schema:
+            type: string
+        - name: date
+          in: query
+          description: date
+          example: "2023-11-26"
+          required: true
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Successful response
+  /api/schedule:
+    get:
+      summary: Get Schedule
+      parameters:
+        - name: room
+          in: query
+          description: room
+          example: "LN006-H"
+          required: true
+          schema:
+            type: string
+        - name: from
+          in: query
+          description: date
+          example: "2023-11-26"
+          required: true
+          schema:
+            type: string
+        - name: to
+          in: query
+          description: date
+          example: "2023-11-30"
+          required: true
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Successful response
+  /api/createFeed:
+    post:
+      summary: Create iCal Feed
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: array
+              items:
+                $ref: '#/components/schemas/Module'
+              required:
+                - name
+                - modules
       responses:
         '200':
           description: Successful response
   /api/feed:
     get:
       summary: Get iCal Feed for calendar
+      parameters:
+        - name: token
+          in: query
+          description: calendar token
+          required: true
+          example: "ldluwzg3e73ffxq"
+          schema:
+            type: string
+      responses:
+        '200':
+          description: Successful response
+  /api/course/modules:
+    get:
+      summary: Get Modules for Course
+      parameters:
+        - name: course
+          in: query
+          description: course
+          required: true
+          example: "Software Engineering"
+          schema:
+            type: string
+        - name: semester
+          in: query
+          description: semester
+          required: true
+          example: "ws"
+          schema:
+              type: string
+      responses:
+        '200':
+          description: Successful response
+  /api/module:
+    get:
+      summary: Get Module
+      parameters:
+        - name: uuid
+          in: query
+          description: uuid
+          required: true
+          example: "d0b3a0e0-2f1a-4e1a-8b0a-0b9e1a0b9e1a"
+          schema:
+              type: string
+      responses:
+        '200':
+          description: Successful response
+  /api/courses:
+    get:
+      summary: Get Courses
       responses:
         '200':
           description: Successful response
@@ -51,3 +171,52 @@ paths:
       responses:
         '200':
           description: Successful response
+  /api/events:
+    delete:
+        summary: Delete Event
+        security:
+            - ApiKeyAuth: []
+        responses:
+          '200':
+            description: Successful response
+  /api/feeds/migrate:
+    get:
+      summary: Migrates all iCal Feeds in the database to the new format
+      security:
+        - ApiKeyAuth: []
+      responses:
+        '200':
+          description: Successful response
+security:
+  - ApiKeyAuth: []
+components:
+    securitySchemes:
+      ApiKeyAuth:
+        type: apiKey
+        in: header
+        name: Authorization
+    schemas:
+      Module:
+        type: object
+        properties:
+          name:
+            type: string
+            description: name
+            example: "Software Engineering"
+          uuid:
+            type: string
+            format: uuid
+          course:
+            type: string
+          userDefinedName:
+            type: string
+          prof:
+            type: string
+          semester:
+            type: string
+          reminder:
+            type: boolean
+          events:
+            type: array
+            items:
+              type: string
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