diff --git a/src/openapi/customers/notifications-crud.yaml b/src/openapi/customers/notifications-crud.yaml
index f6e4a62..3fbec93 100644
--- a/src/openapi/customers/notifications-crud.yaml
+++ b/src/openapi/customers/notifications-crud.yaml
@@ -8,8 +8,7 @@ servers:
 paths:
   /notificationsubscriptions:
     get:
-      summary: Get all notification subscriptions
-      operationId: getAllNotificationSubscriptions
+      summary: Find one or more notification subscriptions
       tags:
         - Notification Subscriptions
       parameters:
@@ -116,6 +115,7 @@ paths:
                 emptyNotificationSubscriptionResponse:
                   value: 
                     notificationSubscriptions: []
+                    href: null
                 minimalNotificationSubscriptionResponse:
                   value:
                     notificationSubscriptions:
@@ -140,6 +140,13 @@ paths:
                       createdAt: '2025-10-01T12:00:00Z'
                       createdBy: system
                       isActive: true
+                      _links:
+                        edit:
+                          href: /notificationsubscriptions/5bedce29-af0c-4f3c-b182-2caa8a1f9377
+                          method: PATCH
+                        delete:
+                          href: /notificationsubscriptions/5bedce29-af0c-4f3c-b182-2caa8a1f9377
+                          method: DELETE
                     - notificationSubscriptionId: 39e8d8e6-5c85-49b6-ba4b-62e47fa4f7fd
                       eventTypeChannel:
                         eventTypeChannelId: c4729ad4-46ef-4329-94f9-5079be21dfc5
@@ -161,6 +168,14 @@ paths:
                       createdAt: '2025-09-15T08:30:00Z'
                       createdBy: system
                       isActive: false
+                      _links:
+                        edit:
+                          href: /notificationsubscriptions/39e8d8e6-5c85-49b6-ba4b-62e47fa4f7fd
+                          method: PATCH
+                        delete:
+                          href: /notificationsubscriptions/39e8d8e6-5c85-49b6-ba4b-62e47fa4f7fd
+                          method: DELETE
+                    href: null
                 fullNotificationSubscriptionResponse:
                   value:
                     notificationSubscriptions:
@@ -190,6 +205,13 @@ paths:
                       updatedAt: '2025-10-02T12:00:00Z'
                       updatedBy: user
                       isActive: true
+                      _links:
+                        edit:
+                          href: /notificationsubscriptions/5bedce29-af0c-4f3c-b182-2caa8a1f9377
+                          method: PATCH
+                        delete:
+                          href: /notificationsubscriptions/5bedce29-af0c-4f3c-b182-2caa8a1f9377
+                          method: DELETE
                     - notificationSubscriptionId: 39e8d8e6-5c85-49b6-ba4b-62e47fa4f7fd
                       eventTypeChannel:
                         eventTypeChannelId: c4729ad4-46ef-4329-94f9-5079be21dfc5
@@ -216,6 +238,14 @@ paths:
                       updatedAt: '2025-09-16T09:45:00Z'
                       updatedBy: user
                       isActive: false
+                      _links:
+                        edit:
+                          href: /notificationsubscriptions/39e8d8e6-5c85-49b6-ba4b-62e47fa4f7fd
+                          method: PATCH
+                        delete:
+                          href: /notificationsubscriptions/39e8d8e6-5c85-49b6-ba4b-62e47fa4f7fd
+                          method: DELETE
+                    href: null
         '400':
           description: Bad request
           content:
@@ -246,7 +276,6 @@ paths:
                 $ref: '#/components/schemas/500Response'
     post:
       summary: Create a new notification subscription
-      operationId: createNotificationSubscription
       tags:
         - Notification Subscriptions
       requestBody:
@@ -472,7 +501,6 @@ paths:
                 $ref: '#/components/schemas/500Response'
     delete:
       summary: Delete a notification subscription by ID
-      operationId: deleteNotificationSubscription
       tags:
         - Notification Subscriptions
       parameters:
@@ -514,6 +542,388 @@ paths:
               schema:
                 type: object
                 $ref: '#/components/schemas/500Response'
+  /eventorigins:
+    get:
+      summary: Get all event origins
+      tags:
+        - References
+      responses:
+        '200':
+          description: A list of event origins
+          content:
+            application/json:
+              schema:
+                  $ref: '#/components/schemas/GetEventOriginsResponse'
+              examples:
+                eventOriginsResponse:
+                  value:
+                    eventOrigins:
+                      - eventOriginId: 1
+                        name: GBO
+                        description: Events originated at GBO
+                      - eventOriginId: 2
+                        name: Website
+                        description: Events originated at the website
+                      - eventOriginId: 3
+                        name: Payt
+                        description: Events originated at Payt
+                      - eventOriginId: 4
+                        name: Twikey
+                        description: Events originated at Twikey
+                      - eventOriginId: 5
+                        name: TapConnect
+                        description: Events originated at TapConnect
+        '400':
+          description: Bad request
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/400Response'
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/401Response'
+        '404':
+          description: Not found
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/404Response'
+        '500':
+          description: Internal server error
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/500Response'
+  /channels:
+    get:
+      summary: Get all channels
+      tags:
+        - References
+      responses:
+        '200':
+          description: A list of channels
+          content:
+            application/json:
+              schema:
+                  $ref: '#/components/schemas/GetChannelsResponse'
+              examples:
+                channelsResponse:
+                  value:
+                    channels:
+                      - channelId: 1
+                        name: push
+                      - channelId: 2
+                        name: email
+                      - channelId: 3
+                        name: sms
+                      - channelId: 4
+                        name: mail
+        '400':
+          description: Bad request
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/400Response'
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/401Response'
+        '404':
+          description: Not found
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/404Response'
+        '500':
+          description: Internal server error
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/500Response'
+  /notificationcategories:
+    get:
+      summary: Get all notification categories
+      tags:
+        - References
+      responses:
+        '200':
+          description: A list of notification categories
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/GetNotificationCategoriesResponse'
+              examples:
+                notificationCategoriesResponse:
+                  value:
+                    notificationCategories:
+                      - notifcationCategoryId: 1
+                        name: Mijn Reizen
+                      - notifcationCategoryId: 2
+                        name: Mijn Passen
+                      - notifcationCategoryId: 3
+                        name: Service Alerts
+                      - notifcationCategoryId: 4
+                        name: Service Berichten
+                      - notifcationCategoryId: 5
+                        name: Mijn Betalingen
+        '400':
+          description: Bad request
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/400Response'
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/401Response'
+        '404':
+          description: Not found
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/404Response'
+        '500':
+          description: Internal server error
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/500Response'
+  /eventtypes:
+    get:
+      summary: Get all event types
+      tags:
+        - References
+      responses:
+        '200':
+          description: A list of event types
+          content:
+            application/json:
+              schema:
+                  $ref: '#/components/schemas/GetEventTypesResponse'
+              examples:
+                eventTypesResponse:
+                  value:
+                    eventTypes:
+                      - eventTypeId: 15
+                        eventOrigin:
+                          eventOriginId: 1
+                          name: GBO
+                          description: Events originated at GBO
+                        name: Travel
+                        subname: Missing CKO
+                        prettyName: Checkout gemist
+                        optInRequired: true
+                      - eventTypeId: 16
+                        eventOrigin:
+                          eventOriginId: 1
+                          name: GBO
+                          description: Events originated at GBO
+                        name: Travel
+                        subname: Missing CKI
+                        prettyName: Checkin gemist
+                        optInRequired: true
+                      - eventTypeId: 25
+                        eventOrigin:
+                          eventOriginId: 3
+                          name: Payt
+                          description: Events originated at Payt
+                        name: Payment
+                        subname: Failed Payment
+                        prettyName: Betaling mislukt
+                        optInRequired: false
+        '400':
+          description: Bad request
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/400Response'
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/401Response'
+        '404':
+          description: Not found
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/404Response'
+        '500':
+          description: Internal server error
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/500Response'
+  /eventtypecategories:
+    get:
+      summary: Get all event type categories
+      tags:
+        - References
+      responses:
+        '200':
+          description: A list of event type categories
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/GetEventTypeCategoriesResponse'
+              examples:
+                eventTypeCategoriesResponse:
+                  value:
+                    eventTypeCategories:
+                      - eventType:
+                          eventTypeId: 15
+                          eventOrigin:
+                            eventOriginId: 1
+                            name: GBO
+                            description: Events originated at GBO
+                          name: Travel
+                          subname: Missing CKO
+                          prettyName: Checkout gemist
+                          optInRequired: true
+                        notificationCategory:
+                          notifcationCategoryId: 1
+                          name: Mijn Reizen
+                      - eventType:
+                          eventTypeId: 16
+                          eventOrigin:
+                            eventOriginId: 1
+                            name: GBO
+                            description: Events originated at GBO
+                          name: Travel
+                          subname: Missing CKI
+                          prettyName: Checkin gemist
+                          optInRequired: true
+                        notificationCategory:
+                          notifcationCategoryId: 1
+                          name: Mijn Reizen
+        '400':
+          description: Bad request
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/400Response'
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/401Response'
+        '404':
+          description: Not found
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/404Response'
+        '500':
+          description: Internal server error
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/500Response'
+  /eventtypechannels:
+    get:
+      summary: Get all event type channels
+      tags:
+        - References
+      responses:
+        '200':
+          description: A list of event type channels
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/GetEventTypeChannelResponse'
+              examples:
+                eventTypeChannelsResponse:
+                  value:
+                    eventTypeChannels:
+                      - eventTypeChannelId: 22a9ab1cb-b1a3-482e-bae3-9a517a8cfb4f
+                        eventType:
+                          eventTypeId: 15
+                          eventOrigin:
+                            eventOriginId: 1
+                            name: GBO
+                            description: Events originated at GBO
+                          name: Travel
+                          subname: Missing CKO
+                          prettyName: Checkout gemist
+                          optInRequired: true
+                        channel:
+                          channelId: 1
+                          name: push
+                        isDefault: true
+                        isMandatory: false
+                      - eventTypeChannelId: c4729ad4-46ef-4329-94f9-5079be21dfc5
+                        eventType:
+                          eventTypeId: 16
+                          eventOrigin:
+                            eventOriginId: 1
+                            name: GBO
+                            description: Events originated at GBO
+                          name: Travel
+                          subname: Missing CKI
+                          prettyName: Checkin gemist
+                          optInRequired: true
+                        channel:
+                          channelId: 1
+                          name: push
+                        isDefault: true
+                        isMandatory: false
+        '400':
+          description: Bad request
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/400Response'
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/401Response'
+        '404':
+          description: Not found
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/404Response'
+        '500':
+          description: Internal server error
+          content:
+            application/json:
+              schema:
+                type: object
+                $ref: '#/components/schemas/500Response'
 components:
   schemas:
     GetNotificationSubscriptionsResponse:
@@ -523,8 +933,11 @@ components:
           type: array
           items:
             $ref: '#/components/schemas/NotificationSubscription'
+        href:
+          type: string
       required:
         - notificationSubscriptions
+        - href
     NotificationSubscription:
       type: object
       properties:
@@ -615,6 +1028,53 @@ components:
           example: false
     PatchNotificationSubscriptionResponse:
       $ref: '#/components/schemas/NotificationSubscription'
+    GetEventOriginsResponse:
+      type: object
+      properties:
+        eventOrigins:
+          type: array
+          items:
+            $ref: '#/components/schemas/EventOrigin'
+    GetChannelsResponse:
+      type: object
+      properties:
+        channels:
+          type: array
+          items:
+            $ref: '#/components/schemas/Channel'
+    GetNotificationCategoriesResponse:
+      type: object
+      properties:
+        notificationCategories:
+          type: array
+          items:
+            $ref: '#/components/schemas/NotificationCategory'
+    GetEventTypesResponse:
+      type: object
+      properties:
+        eventTypes:
+          type: array
+          items:
+            $ref: '#/components/schemas/EventType'
+    GetEventTypeCategoriesResponse:
+      type: object
+      properties:
+        eventTypeCategories:
+          type: array
+          items:
+            type: object
+            properties:
+              eventType:
+                $ref: '#/components/schemas/EventType'
+              notificationCategory:
+                $ref: '#/components/schemas/NotificationCategory'
+    GetEventTypeChannelResponse:
+      type: object
+      properties:
+        eventTypeChannels:
+          type: array
+          items:
+            $ref: '#/components/schemas/EventTypeChannel'
     EventTypeChannel:
       type: object
       properties:
@@ -691,6 +1151,18 @@ components:
       required:
         - channelId
         - name
+    NotificationCategory:
+      type: object
+      properties:
+        notifcationCategoryId:
+          type: integer
+          example: 1
+        name:
+          type: string
+          example: Mijn Reizen
+      required:
+        - notifcationCategoryId
+        - name
     400Response:
       type: object
       properties: