diff --git a/src/openapi/contracts/contracts-crud.yaml b/src/openapi/contracts/contracts-crud.yaml
index 8560cec..25205ff 100644
--- a/src/openapi/contracts/contracts-crud.yaml
+++ b/src/openapi/contracts/contracts-crud.yaml
@@ -206,7 +206,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/Contract"
+                $ref: "#/components/schemas/Contracts"
               example:
                 {
                   "contracts":
@@ -502,7 +502,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/Contract"
+              $ref: "#/components/schemas/PatchContractsRequestBody"
             example:
               {
                 "contract":
@@ -518,7 +518,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/Contract"
+                $ref: "#/components/schemas/PatchContractsResponseBody"
               example:
                 {
                   "contract":
@@ -546,7 +546,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/InvoiceAccountingStatus"
+              $ref: "#/components/schemas/PostContractVersionsRequestBody"
             example:
               {
                 "contractVersion":
@@ -567,7 +567,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/ContractVersion"
+                $ref: "#/components/schemas/PostContractVersionsResponseBody"
               example:
                 {
                   "contractVersion":
@@ -602,7 +602,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/ContractVersion"
+              $ref: "#/components/schemas/PatchContractVersionsRequestBody"
             example: { "contractVersion": { "end": "2024-07-03 15:01:00.000" } }
       responses:
         "200":
@@ -610,7 +610,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/ContractVersion"
+                $ref: "#/components/schemas/PatchContractVersionsResponseBody"
               example:
                 {
                   "contractVersion":
@@ -619,6 +619,14 @@ paths:
                       "contractVersionId": 1,
                     },
                 }
+    delete:
+      summary: Delete an existing contract version.
+      description: Delete an existing contract version.
+      tags:
+        - ContractVersion
+      responses:
+        "200":
+          description: OK
   /contracts/{contractId}/contractinvoices:
     parameters:
       - in: path
@@ -629,67 +637,6 @@ paths:
           example: d1dd439b-6072-4b97-89c9-724268865b93
         required: true
         description: The contractId of the Contract, formatted as UUID.
-    get:
-      summary: Get invoices of a single contract. DEPRECATED.
-      description: Get invoices of a single contract. WARNING; This method is deprecated. Please use GET /contractinvoices instead.
-      deprecated: true
-      tags:
-        - ContractInvoice
-      responses:
-        "200":
-          description: OK
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/ContractInvoice"
-              example:
-                {
-                  "contractInvoices":
-                    [
-                      {
-                        "contractInvoiceId": "8699d72a-cf4d-4e6b-9e9c-549d837ca51f",
-                        "externalReference": "F2024-0001",
-                        "term": 1,
-                        "invoiceDate": "2024-07-02",
-                        "created": "2024-07-02 15:01:00.000",
-                        "updated": "2024-07-02 15:01:00.000",
-                        "state": "invoice_sent",
-                        "data": "{json}",
-                        "isCredit": false,
-                        "invoiceAccountingStatuses":
-                          [
-                            {
-                              "invoiceAccountingStatusId": "32785417-1fb8-42c7-bda1-533f5868809f",
-                              "accountingStatus":
-                                { "accountingStatusId": 1, "name": "open" },
-                              "createdOn": "2024-06-02 15:01:00.000",
-                              "description": null,
-                            },
-                          ],
-                      },
-                      {
-                        "contractInvoiceId": "dadff658-4ff5-4eb8-b516-492f1f6c6245",
-                        "externalReference": "F2024-0002",
-                        "term": 2,
-                        "invoiceDate": "2024-08-02",
-                        "created": "2024-08-02 15:01:00.000",
-                        "updated": "2024-08-02 15:01:00.000",
-                        "state": "invoice_created",
-                        "data": "{json}",
-                        "isCredit": false,
-                        "invoiceAccountingStatuses":
-                          [
-                            {
-                              "invoiceAccountingStatusId": "84af0f01-0416-4860-851a-a0d4b3cf674a",
-                              "accountingStatus":
-                                { "accountingStatusId": 1, "name": "open" },
-                              "createdOn": "2024-06-02 15:01:00.000",
-                              "description": null,
-                            },
-                          ],
-                      },
-                    ],
-                }
     post:
       summary: Add an invoice to an existing contract.
       description: Add an invoice to an existing contract.
@@ -699,7 +646,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/ContractInvoice"
+              $ref: "#/components/schemas/PostContractInvoicesRequestBody"
             example:
               {
                 "contractInvoice":
@@ -728,7 +675,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/ContractInvoice"
+                $ref: "#/components/schemas/PostContractInvoicesResponseBody"
               example:
                 {
                   "contractInvoice":
@@ -841,7 +788,12 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/Contract"
+                type: object
+                properties:
+                  contractInvoices:
+                    type: array
+                    items:
+                      $ref: "#/components/schemas/ContractInvoice"
               example:
                 {
                   "contractInvoices":
@@ -911,7 +863,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/ContractInvoice"
+              $ref: "#/components/schemas/PatchContractInvoicesRequestBody"
             example:
               {
                 "contractInvoice":
@@ -927,7 +879,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/ContractInvoice"
+                $ref: "#/components/schemas/PatchContractInvoicesResponseBody"
               example:
                 {
                   "contractInvoice":
@@ -954,7 +906,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/ContractInvoice"
+              $ref: "#/components/schemas/PostInvoiceAccountingStatusesRequestBody"
             example:
               {
                 "accountingStatusId": 1,
@@ -967,7 +919,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/ContractInvoice"
+                $ref: "#/components/schemas/PostInvoiceAccountingStatusesResponseBody"
               example:
                 {
                   "invoiceAccountingStatusId": "a6836364-4812-4960-9226-69deb2e2b903",
@@ -993,7 +945,12 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/Contract"
+                type: object
+                properties:
+                  contractActions:
+                    type: array
+                    items:
+                      $ref: "#/components/schemas/ContractAction"
               example:
                 {
                   "contractActions":
@@ -1025,7 +982,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/ContractAction"
+              $ref: "#/components/schemas/PostContractActionsRequestBody"
             example:
               {
                 "contractAction":
@@ -1043,7 +1000,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/ContractAction"
+                $ref: "#/components/schemas/PostContractActionsResponseBody"
               example:
                 {
                   "contractAction":
@@ -1063,7 +1020,12 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/ContractStatus"
+                type: object
+                properties:
+                  contractStatuses:
+                    type: array
+                    items:
+                      $ref: "#/components/schemas/ContractStatus"
               example:
                 {
                   "contractStatuses":
@@ -1089,7 +1051,12 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/ActionType"
+                type: object
+                properties:
+                  actionTypes:
+                    type: array
+                    items:
+                      $ref: "#/components/schemas/ActionType"
               example:
                 {
                   "actionTypes":
@@ -1207,6 +1174,315 @@ components:
             - contractNumber
       required:
         - contract
+    PatchContractsRequestBody:
+      type: object
+      properties:
+        contract:
+          type: object
+          properties:
+            contractStatusId:
+              type: integer
+              example: 2
+            billingDay:
+              type: integer
+              example: 15
+            highestInvoiceTerm:
+              type: integer
+              example: 2
+      required:
+        - contract
+    PatchContractsResponseBody:
+      type: object
+      properties:
+        contract:
+          type: object
+          properties:
+            contractId:
+              type: string
+              format: uuid
+              example: 5a3876a1-e9a1-4278-8983-4679a8d583c2
+            contractNumber:
+              type: string
+              pattern: '^D\d{6}$'
+              example: D123456
+          required:
+            - contractId
+            - contractNumber
+      required:
+        - contract
+    PostContractVersionsRequestBody:
+      type: object
+      properties:
+        contractVersion:
+          type: object
+          properties:
+            termsAndConditions:
+              type: string
+              format: url
+              example: https://www.htm.nl/reisproducten/productvoorwaarden/htm-maandkorting/
+            productId:
+              type: integer
+              example: 1
+            productName:
+              type: string
+              example: HTM Maand 20% korting
+            taxCode:
+              type: string
+              example: V9
+            taxPercentage:
+              type: number
+              format: float
+              example: 9.0
+            termAmountInclTax:
+              type: integer
+              example: 400
+            start:
+              type: string
+              format: date-time
+              example: 2024-07-04 15:01:00.000
+            end:
+              type: string
+              format: date-time
+              example: 2024-12-31 15:01:00.000
+          required:
+            - termsAndConditions
+            - productId
+            - productName
+            - taxCode
+            - taxPercentage
+            - termAmountInclTax
+            - start
+      required:
+        - contractVersion
+    PostContractVersionsResponseBody:
+      type: object
+      properties:
+        contractVersion:
+          type: object
+          properties:
+            contractId:
+              type: string
+              format: uuid
+              example: 5a3876a1-e9a1-4278-8983-4679a8d583c2
+            contractVersionId:
+              type: integer
+              example: 1
+          required:
+            - contractId
+            - contractVersionId
+      required:
+        - contractVersion
+    PatchContractVersionsRequestBody:
+      type: object
+      properties:
+        contractVersion:
+          type: object
+          properties:
+            end:
+              type: string
+              format: date-time
+              example: 2024-12-31 15:01:00.000
+      required:
+        - contractVersion
+    PatchContractVersionsResponseBody:
+      type: object
+      properties:
+        contractVersion:
+          type: object
+          properties:
+            contractId:
+              type: string
+              format: uuid
+              example: 5a3876a1-e9a1-4278-8983-4679a8d583c2
+            contractVersionId:
+              type: integer
+              example: 1
+          required:
+            - contractId
+            - contractVersionId
+      required:
+        - contractVersion
+    PostContractInvoicesRequestBody:
+      type: object
+      properties:
+        contractInvoice:
+          type: object
+          properties:
+            externalReference:
+              type: string
+              example: F2024-0001
+            term:
+              type: integer
+              example: 1
+            invoiceDate:
+              type: string
+              format: date
+              example: 2024-07-02
+            created:
+              type: string
+              format: date-time
+              example: 2024-07-02 15:01:00.000
+            updated:
+              type: string
+              format: date-time
+              example: 2024-07-02 15:01:00.000
+            state:
+              type: string
+              example: invoice_created
+            data:
+              type: string
+              format: json
+              example: "{json}"
+            isCredit:
+              type: boolean
+              example: false
+            invoiceAccountingStatuses:
+              type: array
+              items:
+                type: object
+                properties:
+                  accountingStatusId:
+                    type: integer
+                    example: 1
+                  createdOn:
+                    type: string
+                    format: date-time
+                    example: 2024-07-02 15:01:00.000
+                  description:
+                    type: string
+                    example: null
+                required:
+                  - accountingStatusId
+                  - createdOn
+          required:
+            - externalReference
+            - term
+            - invoiceDate
+            - created
+            - updated
+            - state
+            - data
+            - isCredit
+            - invoiceAccountingStatuses
+      required:
+        - contractInvoice
+    PostContractInvoicesResponseBody:
+      type: object
+      properties:
+        contractInvoice:
+          type: object
+          properties:
+            contractInvoiceId:
+              type: string
+              format: uuid
+              example: 8699d72a-cf4d-4e6b-9e9c-549d837ca51f
+          required:
+            - contractInvoiceId
+      required:
+        - contractInvoice
+    PatchContractInvoicesRequestBody:
+      type: object
+      properties:
+        contractInvoice:
+          type: object
+          properties:
+            updated:
+              type: string
+              format: date-time
+              example: 2024-07-02 15:01:00.000
+            state:
+              type: string
+              example: invoice_reopened
+            data:
+              type: string
+              format: json
+              example: "{json}"
+      required:
+        - contractInvoice
+    PatchContractInvoicesResponseBody:
+      type: object
+      properties:
+        contractInvoice:
+          type: object
+          properties:
+            contractInvoiceId:
+              type: string
+              format: uuid
+              example: 8699d72a-cf4d-4e6b-9e9c-549d837ca51f
+          required:
+            - contractInvoiceId
+      required:
+        - contractInvoice
+    PostInvoiceAccountingStatusesRequestBody:
+      type: object
+      properties:
+        accountingStatusId:
+          type: integer
+          example: 1
+        createdOn:
+          type: string
+          format: date-time
+          example: 2024-07-02 15:01:00.000
+        description:
+          type: string
+          example: null
+      required:
+        - accountingStatusId
+        - createdOn
+    PostInvoiceAccountingStatusesResponseBody:
+      type: object
+      properties:
+        invoiceAccountingStatusId:
+          type: string
+          format: uuid
+          example: a6836364-4812-4960-9226-69deb2e2b903
+      required:
+        - invoiceAccountingStatusId
+    PostContractActionsRequestBody:
+      type: object
+      properties:
+        contractAction:
+          type: object
+          properties:
+            actionType:
+              type: integer
+              example: 2
+            user:
+              type: string
+              example: subid123456
+            timestamp:
+              type: string
+              format: date-time
+              example: 2024-07-02 15:01:00.000
+            details:
+              type: string
+              example: Contract changed xyz
+            correlationId:
+              type: string
+              format: uuid
+              example: 976e7a4c-bf24-43d2-b444-55817556e7ee
+          required:
+            - actionType
+            - user
+            - timestamp
+            - details
+            - correlationId
+      required:
+        - contractAction
+    PostContractActionsResponseBody:
+      type: object
+      properties:
+        contractAction:
+          type: object
+          properties:
+            contractActionId:
+              type: string
+              format: uuid
+              example: 8699d72a-cf4d-4e6b-9e9c-549d837ca51f
+          required:
+            - contractActionId
+      required:
+        - contractAction
     Contract:
       type: object
       properties: