diff --git a/src/openapi/orders/service_engine_orders.yaml b/src/openapi/orders/service_engine_orders.yaml
index adaebe9..09cb658 100644
--- a/src/openapi/orders/service_engine_orders.yaml
+++ b/src/openapi/orders/service_engine_orders.yaml
@@ -5300,6 +5300,261 @@ paths:
                       },
                     ],
                 }
+  /orders/{orderId}/ordervouchers:
+    parameters:
+      - in: path
+        name: orderId
+        required: true
+        style: simple
+        explode: false
+        schema:
+          type: string
+          format: uuid
+          example: a0ef57fa-395c-4a03-96e9-234c26dccea9
+      - in: header
+        name: X-HTM-JWT-AUTH-HEADER
+        schema:
+          type: string
+          example: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
+        description: The JWT of the logged in customer (in case of a web shop).
+    post:
+      tags:
+        - Order Creation Flow
+      summary: Add a voucher to an existing orders.
+      description: Add a voucher to an existing order.
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/unavailable"
+            examples:
+              Add a voucher to an existing order:
+                summary: Add a voucher to an existing order
+                description: Add a voucher to an existing order
+                value:
+                  {
+                    "voucherCode": "Voucher1234",
+                    "orderLineId": "6bb3d8a1-474f-4bdb-9cbc-31bf4ed0482e"
+                  }
+      responses:
+        "201":
+          description: Created
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/unavailable"
+              examples:
+                Order with added voucher:
+                  value:
+                    {
+                      "validContents": true,
+                      "orderId": "1e441d7d-50d6-4006-aca7-5e87e2f218df",
+                      "externalOrderId": null,
+                      "orderNumber": "ORD-123456",
+                      "customerProfileId": 1337,
+                      "totalAmount": 121,
+                      "touchPoint":
+                        {
+                          "salesTouchpointId": 3,
+                          "name": "Website (Perplex)",
+                          "isActive": true,
+                          "retailerId": 1001,
+                        },
+                      "language":
+                        {
+                          "languageId": 1,
+                          "name": "Nederlands",
+                          "iso639Code": "nl-NL",
+                          "ietfCode": "nl",
+                        },
+                      "createdOn": "2024-03-22T09:00:00",
+                      "lastUpdatedOn": "2024-03-22T09:00:00",
+                      "order_OrderStatuses":
+                        [
+                          {
+                            "order_orderStatusId": "f1d0e1a7-a3cf-4876-b8f2-073add10667f",
+                            "orderStatus":
+                              { "orderStatusId": 1, "name": "concept" },
+                            "createdOn": "2024-03-22T09:00:00",
+                            "description": "Order is aangemaakt",
+                          },
+                        ],
+                      "order_OrderVouchers":
+                        [
+                          {
+                            "order_orderVoucherId": "a66f224f-347b-47e7-b480-0b84b8ef5177",
+                            "issuedVoucher":
+                              { "voucherCode": "HTM1234", 
+                                "productName": "Ooievaarspas voucher",
+                                "productDescription": "Ontvang de ooievaarspas om gratis te reizen bij de HTM",
+                                "voucherStatus": {
+                                  "voucherStatusId": 2,
+                                  "name": "Issued"
+                                }
+                              },
+                            "orderLineId": "cccada2c-d5ea-48ab-b4be-f590e16b5468",
+                            "validations": [                           
+                              {
+                                "code": "VOUCHER_CLAIM_GBO_BIRTHDATE",
+                                "detail": "Birthdate does not match the claim",
+                                "path": "#/orderLines[cccada2c-d5ea-48ab-b4be-f590e16b5468]/customerToken[878ad7c1-cd8f-4bcf-a983-1bd8c6e6975e]/personalAccountData",
+                                "parameter": "dateOfBirth",
+                                "type": "ERROR"
+                              },
+                              {
+                                "code": "VOUCHER_CLAIM_EMAIL",
+                                "detail": "Email on the order needs to be filled",
+                                "path": "#/orderCustomer",
+                                "parameter": "emailAddress",
+                                "type": "REMARK"
+                              }
+                            ],
+
+                          },
+                        ],
+                      "orderLines":
+                        [
+                          {
+                            "orderLineId": "cccada2c-d5ea-48ab-b4be-f590e16b5468",
+                            "externalOrderLineId": null,
+                            "productId": 1,
+                            "productName": "HTM Maandkorting 20%",
+                            "fikoArticleNumber": "6609",
+                            "productDescription": "HTM Maandkorting 20%",
+                            "taxCode": "V21",
+                            "taxPercentage": 21.0000,
+                            "taxAmount": null,
+                            "amountExclTax": null,
+                            "amountInclTax": 121,
+                            "quantity": 1,
+                            "orderLineTerms":
+                              [
+                                {
+                                  "orderLineTermsId": "cccada2c-d5ea-48ab-b4be-f590e16b5468",
+                                  "termsUrl": "generalTermsAndConditions.pdf",
+                                },
+                                {
+                                  "orderLineTermsId": "bd76f723-9308-4629-a291-4c4fafd7ed87",
+                                  "termsUrl": "productTermsAndConditions.pdf",
+                                },
+                              ],
+                            "createdOn": "2024-03-22T09:00:00",
+                            "validFrom": "2024-03-22T09:00:00",
+                            "validUntil": null,
+                            "orderLineStatus":
+                              { "orderLineStatusId": 1, "name": "pending" },
+                            "customerTokens":
+                              [
+                                {
+                                  "customerTokenId": "878ad7c1-cd8f-4bcf-a983-1bd8c6e6975e",
+                                  "tokenType":
+                                    { "tokenTypeId": 1, "name": "EMV" },
+                                  "ovPayTokenId": 1,
+                                  "serviceReferenceId": "NLOV1234567ABCDEFG",
+                                  "amount": 34,
+                                  "ovpasNumber": "OV34567",
+                                  "verificationCode": "A7H6",
+                                  "personalAccountData":
+                                    {
+                                      "personalAccountDataId": "47db8a40-3238-4bf5-9284-759e3888bd47",
+                                      "name": "Jan de Vries",
+                                      "birthdate": "1970-01-01",
+                                      "photo": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAABGdBTUEAALGPC/xhBQAAACBjSFJNAAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAACXBIWXMAABYlAAAWJQFJUiTwAAAAAWJLR0Q+SWQA4wAAAAd0SU1FB+YCBAwmK58TFQgAAAAldEVYdGRhdGU6Y3JlYXRlADIwMjItMDItMDRUMTI6Mzg6NDMrMDA6MDBAjYOrAAAAJXRFWHRkYXRlOm1vZGlmeQAyMDIyLTAyLTA0VDEyOjM4OjQzKzAwOjAwMdA7FwAAAFd6VFh0UmF3IHByb2ZpbGUgdHlwZSBpcHRjAAB4nOPyDAhxVigoyk/LzEnlUgADIwsuYwsTIxNLkxQDEyBEgDTDZAMjs1Qgy9jUyMTMxBzEB8uASKBKLgDqFxF08kI1lQAAAYdpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0n77u/JyBpZD0nVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkJz8+DQo8eDp4bXBtZXRhIHhtbG5zOng9ImFkb2JlOm5zOm1ldGEvIj48cmRmOlJERiB4bWxuczpyZGY9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkvMDIvMjItcmRmLXN5bnRheC1ucyMiPjxyZGY6RGVzY3JpcHRpb24gcmRmOmFib3V0PSJ1dWlkOmZhZjViZGQ1LWJhM2QtMTFkYS1hZDMxLWQzM2Q3NTE4MmYxYiIgeG1sbnM6dGlmZj0iaHR0cDovL25zLmFkb2JlLmNvbS90aWZmLzEuMC8iPjx0aWZmOk9yaWVudGF0aW9uPjE8L3RpZmY6T3JpZW50YXRpb24+PC9yZGY6RGVzY3JpcHRpb24+PC9yZGY6UkRGPjwveDp4bXBtZXRhPg0KPD94cGFja2V0IGVuZD0ndyc/PiyUmAsAAAANSURBVBhXY3grk/YfAAXYAm/HQierAAAAAElFTkSuQmCC",
+                                      "challengeType":
+                                        {
+                                          "challengeTypeId": 1,
+                                          "name": "email",
+                                        },
+                                      "oneTimePassword": "H5Iiz3JTaQeIV8p",
+                                    },
+                                  "ovPayToken":
+                                    {
+                                      "customerProfileId": 1,
+                                      "ovPayTokenId": 1,
+                                      "xTat": "32089cc8-d187-47ff-a3a9-5c2558def811",
+                                      "tokenType":
+                                        {
+                                          "tokenTypeId": 2,
+                                          "name": "OV-pas physical",
+                                        },
+                                      "alias": "MyToken",
+                                      "tokenStatus":
+                                        {
+                                          "tokenStatusId": 2,
+                                          "name": "Active",
+                                        },
+                                      "expirationDate": "2028-02-01",
+                                      "replacedByTokenId": null,
+                                      "autoReloadRegistration":
+                                        {
+                                          "autoReloadAmount": 500,
+                                          "retailerReferenceId": "abc",
+                                          "arrit": "425f7fc2-1103-4822-9c79-7c4aaa2fb6aa",
+                                          "autoReloadRegistrationStatus": "ACTIVE",
+                                          "autoReloadRegistrationStartDateTime": "2024-06-02T15:03:46Z",
+                                        },
+                                      "ePurse":
+                                        {
+                                          "e-PurseBalance":
+                                            {
+                                              "currency": "EUR",
+                                              "amount": 350,
+                                            },
+                                          "status": "ACTIVE",
+                                          "originDate": "2019-07-16T11:00:00+02:00",
+                                        },
+                                      "personalAccountData":
+                                        {
+                                          "name":
+                                            {
+                                              "inaccuracyFlag": false,
+                                              "inaccuracyFlagReason": null,
+                                              "inaccuracyFlagSetCounter": 0,
+                                              "isValidated": false,
+                                              "changeCounter": 0,
+                                              "maxUpdatesVerificationCount": 0,
+                                              "lastChangeDate": "2024-08-24T14:15:22Z",
+                                            },
+                                          "birthdate":
+                                            {
+                                              "inaccuracyFlag": false,
+                                              "inaccuracyFlagReason": null,
+                                              "inaccuracyFlagSetCounter": 0,
+                                              "isValidated": false,
+                                              "changeCounter": 0,
+                                              "maxUpdatesVerificationCount": 0,
+                                              "lastChangeDate": "2024-08-24T14:15:22Z",
+                                            },
+                                          "photo":
+                                            {
+                                              "inaccuracyFlag": false,
+                                              "inaccuracyFlagReason": null,
+                                              "inaccuracyFlagSetCounter": 0,
+                                              "isValidated": false,
+                                              "changeCounter": 0,
+                                              "maxUpdatesVerificationCount": 0,
+                                              "lastChangeDate": "2024-08-24T14:15:22Z",
+                                            },
+                                        },
+                                      "gboAgeProfile":
+                                        {
+                                          "gboAgeProfileId": 1,
+                                          "name": "Kind (4 t/m 11 jaar)",
+                                          "ageFromInclusive": 4,
+                                          "ageToInclusive": 11,
+                                        },
+                                    },
+                                },
+                              ],
+                            "orderAccountingStatuses": [],
+                            "validationResult": "valid",
+                            "additionalRemarks": [],
+                            "validationErrors": [],
+                          },
+                        ],
+                      "payments": [],
+                      "orderCustomer": null
+                    }  
   /orders/{orderId}/fulfill:
     parameters:
       - in: path