diff --git a/backend/api.yaml b/backend/api.yaml
index 0e60bbd3..d0684e4b 100644
--- a/backend/api.yaml
+++ b/backend/api.yaml
@@ -77,12 +77,8 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/User"
-        "401":
-          description: Not logged in
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/NotLoggedIn"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /user/name:
     patch:
       operationId: updateUserName
@@ -108,12 +104,8 @@ paths:
                   message:
                     type: string
                     example: Successfully updated name
-        "401":
-          description: Not logged in.
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/NotLoggedIn"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /user/pronouns:
     patch:
       operationId: updateUserPronouns
@@ -139,12 +131,8 @@ paths:
                   message:
                     type: string
                     example: Successfully updated pronouns
-        "401":
-          description: Not logged in.
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/NotLoggedIn"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /user/gender:
     patch:
       operationId: updateUserGender
@@ -170,12 +158,8 @@ paths:
                   message:
                     type: string
                     example: Successfully updated gender
-        "401":
-          description: Not logged in.
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/NotLoggedIn"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /user/zid:
     patch:
       operationId: updateUserZid
@@ -201,12 +185,8 @@ paths:
                   message:
                     type: string
                     example: Successfully updated zID
-        "401":
-          description: Not logged in.
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/NotLoggedIn"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /user/degree:
     patch:
       operationId: updateUserDegree
@@ -235,12 +215,8 @@ paths:
                   message:
                     type: string
                     example: Successfully updated email
-        "401":
-          description: Not logged in.
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/NotLoggedIn"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /user/applications:
     get:
       operationId: getUserApplications
@@ -258,12 +234,8 @@ paths:
                     type: array
                     items:
                       $ref: "#/components/schemas/ApplicationDetails"
-        "401":
-          description: Not logged in.
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/NotLoggedIn"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
 
   /organisation:
     post:
@@ -305,6 +277,8 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/Unauthorized"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /organisation/slug_check:
     post:
       operationId: checkOrganisationSlugAvailability
@@ -336,6 +310,8 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/BadRequest"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /organisation/{id}:
     get:
       operationId: getOrganisationById
@@ -347,7 +323,7 @@ paths:
           schema:
             type: integer
             format: int64
-      description: Returns info about specified organisation.
+      description: Returns info about specified organisation
       tags:
         - Organisation
       responses:
@@ -356,29 +332,9 @@ paths:
           content:
             application/json:
               schema:
-                properties:
-                  id:
-                    type: integer
-                    format: int64
-                    example: 6996987893965262849
-                  name:
-                    type: string
-                    example: UNSW Software Development Society
-                  logo:
-                    type: string
-                    example: "76718252-2a13-4de2-bc07-f977c75dc52b"
-                  created_at:
-                    type: string
-                    example: 2024-02-10T18:25:43.511Z
-        "401":
-          description: Not logged in.
-          content:
-            application/json:
-              schema:
-                properties:
-                  error:
-                    type: string
-                    example: Not logged in.
+                $ref: "#/components/schemas/OrganisationDetails"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
     delete:
       operationId: deleteOrganisationById
       parameters:
@@ -389,7 +345,7 @@ paths:
           schema:
             type: integer
             format: int64
-      description: Deletes specified organisation.
+      description: Deletes specified organisation
       tags:
         - Organisation
       responses:
@@ -401,28 +357,111 @@ paths:
                 properties:
                   message:
                     type: string
-                    example: Successfully deleted organisation.
-        "401":
-          description: Not logged in.
+                    example: Successfully deleted organisation
+        "403":
+          description: User is not a SuperUser
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Unauthorized"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
+  /organisation/slug/{slug}:
+    get:
+      operationId: getOrganisationBySlug
+      parameters:
+        - name: slug
+          in: path
+          description: Organisation slug
+          required: true
+          schema:
+            type: string
+      description: Returns info about specified organisation
+      tags:
+        - Organisation
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/OrganisationDetails"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
+  /organisation/{id}/campaign:
+    post:
+      operationId: createCampaign
+      parameters:
+        - name: id
+          in: path
+          description: Organisation ID
+          required: true
+          schema:
+            type: integer
+            format: int64
+      description: Create a new campaign inside specified organisation
+      tags:
+        - Organisation
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/NewCampaign"
+      responses:
+        "200":
+          description: OK
           content:
             application/json:
               schema:
                 properties:
-                  error:
+                  message:
                     type: string
-                    example: Not logged in.
-        "403":
-          description: User is not a super user.
+                    example: Successfully created campaign
+        "401":
+          $ref: "#/components/responses/NotOrganisationAdmin"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
+  /organisation/{id}/campaign/slug_check:
+    post:
+      operationId: checkCampaignSlugAvailability
+      parameters:
+        - name: id
+          in: path
+          description: Organisation ID
+          required: true
+          schema:
+            type: integer
+            format: int64
+      description: Checks availability of campaign slug in specified organisation
+      tags:
+        - Organisation
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              properties:
+                slug:
+                  type: string
+                  example: 2024-subcom-recruitment
+      responses:
+        "200":
+          description: OK
           content:
             application/json:
               schema:
                 properties:
-                  error:
+                  message:
                     type: string
-                    example: Unauthorized
+                    example: Campaign slug is available
+        "401":
+          $ref: "#/components/responses/NotOrganisationAdmin"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /organisation/{id}/campaigns:
     get:
-      operationId: getOrganisationCampaignsById
+      operationId: getAllOrganisationCampaigns
       parameters:
         - name: id
           in: path
@@ -431,7 +470,7 @@ paths:
           schema:
             type: integer
             format: int64
-      description: Returns active campaigns for specified organisation.
+      description: Returns all (active & ended) campaigns for specified organisation. However, ended campaigns cannot have new applications
       tags:
         - Organisation
       responses:
@@ -445,16 +484,68 @@ paths:
                     type: array
                     items:
                       $ref: "#/components/schemas/OrganisationCampaign"
-        "401":
-          description: Not logged in.
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
+  /organisation/{id}/email_template:
+    post:
+      operationId: createEmailTemplate
+      parameters:
+        - name: id
+          in: path
+          description: Organisation ID
+          required: true
+          schema:
+            type: integer
+            format: int64
+      description: Create a new email template within the organisation
+      tags:
+        - Organisation
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/NewEmailTemplate"
+      responses:
+        "200":
+          description: OK
           content:
             application/json:
               schema:
                 properties:
-                  error:
+                  message:
                     type: string
-                    example: Not logged in.
-
+                    example: Successfully created email template
+        "401":
+          $ref: "#/components/responses/NotOrganisationAdmin"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
+  /organisation/{id}/email_templates:
+    get:
+      operationId: getAllOrganisationEmailTemplates
+      parameters:
+        - name: id
+          in: path
+          description: Organisation ID
+          required: true
+          schema:
+            type: integer
+            format: int64
+      description: Get all email templates for specified organisation
+      tags:
+        - Organisation
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/EmailTemplate"
+        "401":
+          $ref: "#/components/responses/NotOrganisationAdmin"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /organisation/{id}/logo:
     patch:
       operationId: updateOrganisationLogoById
@@ -466,7 +557,7 @@ paths:
           schema:
             type: integer
             format: int64
-      description: Updates logo for specified organistion.
+      description: Update logo for specified organistion. Returns a PUT url to upload new image to
       tags:
         - Organisation
       responses:
@@ -478,27 +569,12 @@ paths:
                 properties:
                   upload_url:
                     type: string
-                    description: Presigned S3 url to upload file.
-                    example: https://www.youtube.com/watch?v=dQw4w9WgXcQ
+                    description: Presigned S3 url to upload file
+                    example: https://presignedurldemo.s3.eu-west-2.amazonaws.com/6996987893965262849/2d19617b-46fd-4927-9f53-77d69232ba5d
         "401":
-          description: Not logged in.
-          content:
-            application/json:
-              schema:
-                properties:
-                  error:
-                    type: string
-                    example: Not logged in.
-        "403":
-          description: User is not an organisation admin.
-          content:
-            application/json:
-              schema:
-                properties:
-                  error:
-                    type: string
-                    example: Unauthorized
-
+          $ref: "#/components/responses/NotOrganisationAdmin"
+        "307":
+          $ref: "#/components/responses/NotLoggedIn"
   /organisation/{id}/member:
     get:
       operationId: getOrganisationMembersById
@@ -808,58 +884,6 @@ paths:
                   error:
                     type: string
                     example: Unauthorized
-
-  /organisation/{id}/campaign:
-    post:
-      operationId: createCampaign
-      parameters:
-        - name: id
-          in: path
-          description: Organisation ID
-          required: true
-          schema:
-            type: integer
-            format: int64
-      description: Creates a new campaign inside specified organisation.
-      tags:
-        - Organisation
-      requestBody:
-        required: true
-        content:
-          application/json:
-            schema:
-              properties:
-                name:
-                  type: string
-                  example: 2024 Subcommittee Recruitment
-                description:
-                  type: string
-                  example: Are you excited to make a difference?
-                starts_at:
-                  type: string
-                  example: 2024-03-15T18:25:43.511Z
-                ends_at:
-                  type: string
-                  example: 2024-04-15T18:25:43.511Z
-      responses:
-        "200":
-          description: OK
-          content:
-            application/json:
-              schema:
-                properties:
-                  message:
-                    type: string
-                    example: Successfully created campaign.
-        "403":
-          description: User is not an admin of specified organisation.
-          content:
-            application/json:
-              schema:
-                properties:
-                  error:
-                    type: string
-                    example: Unauthorized
   /campaign:
     get:
       operationId: getAllCampaigns
@@ -1066,7 +1090,7 @@ paths:
                   upload_url:
                     type: string
                     description: Presigned S3 url to upload file.
-                    example: https://www.youtube.com/watch?v=dQw4w9WgXcQ
+                    example: https://presignedurldemo.s3.eu-west-2.amazonaws.com/6996987893965262849/2d19617b-46fd-4927-9f53-77d69232ba5d
         "401":
           description: Not logged in.
           content:
@@ -1670,6 +1694,26 @@ components:
         - Rejected
         - Successful
 
+    OrganisationDetails:
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+          example: 6996987893965262849
+        slug:
+          type: string
+          example: devsoc-unsw
+        name:
+          type: string
+          example: UNSW Software Development Society
+        logo:
+          type: string
+          example: "76718252-2a13-4de2-bc07-f977c75dc52b"
+        created_at:
+          type: string
+          example: 2024-02-10T18:25:43.511Z
+
     OrganisationCampaign:
       type: object
       properties:
@@ -1677,6 +1721,9 @@ components:
           type: integer
           format: int64
           example: 6996987893965262849
+        slug:
+          type: string
+          example: 2024-subcom-recruitment
         name:
           type: string
           example: 2024 Subcommittee Recruitment
@@ -1823,3 +1870,118 @@ components:
           type: integer
           format: int32
           example: 1
+
+    NewCampaign:
+      type: object
+      properties:
+        name:
+          type: string
+          example: 2024 Subcommittee Recruitment
+        slug:
+          type: string
+          example: 2024-subcom-recruitment
+        description:
+          type: string
+          example: Are you excited to make a difference?
+        starts_at:
+          type: string
+          example: 2024-03-15T18:25:43.511Z
+        ends_at:
+          type: string
+          example: 2024-04-15T18:25:43.511Z
+
+    Campaign:
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+          example: 1541815603606036480
+        slug:
+          type: string
+          example: 2024-subcom-recruitment
+        name:
+          type: string
+          example: 2024 Subcommittee Recruitment
+        organisation_id:
+          type: integer
+          format: int64
+          example: 1541815603606036480
+        organisation_name:
+          type: string
+          example: UNSW Software Development Society
+        cover_image:
+          type: string
+          format: uuid
+          example: 05ebad1e-8be4-40c3-9d36-140cac9a0075
+          nullable: true
+        description:
+          type: string
+          example: Are you excited to make a difference?
+          nullable: true
+        starts_at:
+          type: string
+          example: 2024-03-15T18:25:43.511Z
+        ends_at:
+          type: string
+          example: 2024-04-15T18:25:43.511Z
+        created_at:
+          type: string
+          example: 2024-02-15T18:25:43.511Z
+        updated_at:
+          type: string
+          example: 2024-02-15T18:25:43.511Z
+
+    EmailTemplate:
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+          example: 1541815603606036480
+        organisation_id:
+          type: integer
+          format: int64
+          example: 1541815603606036480
+        name:
+          type: string
+          example: Success Email
+        template_subject:
+          type: string
+          example: "[OUTCOME] {{campaign_name}} - {{role_name}}"
+        template_body:
+          type: string
+          example: "Hi {{name}}, you have been successful in your application for {{organisation_name}} {{role_name}}. Regards {{organisation_name}} Exec"
+
+    NewEmailTemplate:
+      type: object
+      properties:
+        name:
+          type: string
+          example: Success Email
+        template_subject:
+          type: string
+          example: "[OUTCOME] {{campaign_name}} - {{role_name}}"
+        template_body:
+          type: string
+          example: "Hi {{name}}, you have been successful in your application for {{organisation_name}} {{role_name}}. Regards {{organisation_name}} Exec"
+
+  responses:
+    NotLoggedIn:
+      description: Redirect to login
+      headers:
+        Location:
+          description: Login url
+          schema:
+            type: string
+            format: uri
+
+    NotOrganisationAdmin:
+      description: User is not an organisation admin
+      content:
+        application/json:
+          schema:
+            properties:
+              error:
+                type: string
+                example: Unauthorized