diff --git a/src/openapi/fiko/fiko-crud.yaml b/src/openapi/fiko/fiko-crud.yaml
index b555d46..a821dcb 100644
--- a/src/openapi/fiko/fiko-crud.yaml
+++ b/src/openapi/fiko/fiko-crud.yaml
@@ -13,6 +13,13 @@ paths:
       tags:
         - Transactions v2
       parameters:
+        - in: query
+          name: transactionItemId
+          schema:
+            type: string
+            format: uuid
+            example: 75174a9d-fff4-4682-b66b-ebd93cbe7ea3
+          description: The id of the transaction item.
         - in: query
           name: sourceName
           schema:
@@ -166,36 +173,6 @@ paths:
           example: 9834b346-d68c-438d-9bd5-6716422c2657
         required: true
         description: The id of the transaction item.
-    get:
-      summary: Get a single transaction item.
-      description: Get a single transaction item.
-      tags:
-        - Transactions v2
-      responses:
-        "200":
-          description: OK
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/unavailable"
-              example:
-                {
-                  "transactionItemId": "afce35b2-1dff-4ace-98d0-4b9ac405c87d",
-                  "sourceName": "Verkoopengine",
-                  "transactionId": "1001236",
-                  "transactionLineId": "1",
-                  "name": "HTM Maandkorting 20%",
-                  "quantity": 1,
-                  "taxCode": "V21",
-                  "amountExclTax": 100,
-                  "amountInclTax": 121,
-                  "amountTax": 21,
-                  "occurredOn": "2024-10-04T00:00:00Z",
-                  "type": "debit",
-                  "productCode": "HTM-MND-20",
-                  "aggregationReference": "FIKO-123456",
-                  "accountingSystemReference": "U4F-123456",
-                }
     patch:
       summary: Update a transaction item.
       description: Update a transaction item.
@@ -331,7 +308,6 @@ paths:
             type: string
             format: uuid
             example: 498e11fd-86c7-4e26-8ca9-c5ed9049da9e
-          required: true
           description: The id of the audit trail.
         - in: query
           name: transactionItemId
@@ -339,7 +315,6 @@ paths:
             type: string
             format: uuid
             example: 9834b346-d68c-438d-9bd5-6716422c2657
-          required: true
           description: The id of the transaction item.
         - in: query
           name: user
@@ -519,7 +494,7 @@ paths:
                           "timestamp": "2022-01-01 00:00:00",
                           "failureReason":
                             {
-                              "failureReasonId": "122be602-139d-49f5-b34f-1e3e2de29408",
+                              "failureReasonId": 12,
                               "reasonCode": "1234ABCD",
                               "reasonDesc": "description",
                             },
@@ -530,10 +505,118 @@ paths:
                       ],
                   },
                 ]
+  /processingfailures/{processingFailureId}:
+    parameters:
+      - in: path
+        name: processingFailureId
+        schema:
+          type: string
+          format: uuid
+          example: 37a8095b-19db-498f-9349-5f37d21c5bdf
+        required: true
+        description: The id of the processing failure.
+    patch:
+      summary: Update processing failure.
+      description: Update processing failure.
+      tags:
+        - Failures v2
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/unavailable"
+            example: { "status": "open", "occurence": 2 }
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/unavailable"
+              example:
+                {
+                  "processingFailureId": "37a8095b-19db-498f-9349-5f37d21c5bdf",
+                }
+  /processingfailures/{processingFailureId}/processingfailureinstances:
+    parameters:
+      - in: path
+        name: processingFailureId
+        schema:
+          type: string
+          format: uuid
+          example: 37a8095b-19db-498f-9349-5f37d21c5bdf
+        required: true
+        description: The id of the processing failure.
+    post:
+      summary: Add a processing failure instance to a processing failure.
+      description: Add a processing failure instance to a processing failure.
+      tags:
+        - Failures v2
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/unavailable"
+            example:
+              {
+                "timestamp": "2022-01-01 00:00:00",
+                "failureReasonId": 12,
+                "element": "costCenter",
+                "occurence": 1,
+                "change": "Adapt config",
+              }
+      responses:
+        "201":
+          description: Created
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/unavailable"
+              example:
+                {
+                  "processingFailureInstanceId": "9afa9a6b-5b6a-4b0a-9c9e-4b0a5b6a4b0a",
+                }
+  /processingfailureinstances/{processingFailureInstanceId}:
+    parameters:
+      - in: path
+        name: processingFailureInstanceId
+        schema:
+          type: string
+          format: uuid
+          example: 37a8095b-19db-498f-9349-5f37d21c5bdf
+        required: true
+        description: The id of the processing failure instance.
+    patch:
+      summary: Update processing failure instance.
+      description: Update processing failure instance.
+      tags:
+        - Failures v2
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/unavailable"
+            example:
+              {
+                "timestamp": "2022-01-01 00:00:00",
+                "occurence": 2,
+                "change": "Adapt config",
+              }
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/unavailable"
+              example:
+                {
+                  "processingFailureInstanceId": "37a8095b-19db-498f-9349-5f37d21c5bdf",
+                }
   /productmetadata:
     get:
-      summary: Get all product metadata.
-      description: Get all product metadata.
+      summary: Find product metadata.
+      description: Find product metadata.
       tags:
         - Metadata v2
       parameters:
@@ -581,11 +664,17 @@ paths:
             example: VERK_FACTUUR
           description: The document code.
         - in: query
-          name: timestampUpdated
+          name: updatedBefore
           schema:
             type: string
             example: 2022-01-01 00:00:00
-          description: The timestamp updated.
+          description: Timestamp that the metadata was updated before.
+        - in: query
+          name: updatedAfter
+          schema:
+            type: string
+            example: 2022-01-01 00:00:00
+          description: Timestamp that the metadata was updated after.
         - in: query
           name: validAt
           schema:
@@ -811,7 +900,9 @@ paths:
               schema:
                 $ref: "#/components/schemas/unavailable"
               example:
-                { "productContraAccountId": "39a87c2a-9011-4dfd-b35e-1245a98c2e61" }
+                {
+                  "productContraAccountId": "39a87c2a-9011-4dfd-b35e-1245a98c2e61",
+                }
   /productmetadata/{productMetadataId}/metadataaudittrails:
     parameters:
       - in: path
@@ -832,7 +923,20 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/postMetadataAuditTrailRequest"
+              $ref: "#/components/schemas/unavailable"
+            example:
+              {
+                "user": "rmeeuws",
+                "timestamp": "2024-10-04T00:00:00",
+                "correlationId": "a03cd0c2-38b5-4619-b9e3-d6e5b842e127",
+                "metadataChanges": [
+                  {
+                    "fieldName": "department",
+                    "oldValue": "900",
+                    "newValue": "999",
+                  }
+                ]
+              }
       responses:
         "201":
           description: Created
@@ -969,7 +1073,20 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/postMetadataAuditTrailRequest"
+              $ref: "#/components/schemas/unavailable"
+            example:
+              {
+                "user": "rmeeuws",
+                "timestamp": "2024-10-04T00:00:00",
+                "correlationId": "a03cd0c2-38b5-4619-b9e3-d6e5b842e127",
+                "metadataChanges": [
+                  {
+                    "fieldName": "contraAccountMetadataId",
+                    "oldValue": "873810a3-a11a-4d4d-9af7-395520fa207c",
+                    "newValue": "9a8eb116-5270-4ef9-81ef-fdc2e72c281a",
+                  }
+                ]
+              }
       responses:
         "201":
           description: Created
@@ -1136,7 +1253,20 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/postMetadataAuditTrailRequest"
+              $ref: "#/components/schemas/unavailable"
+            example:
+              {
+                "user": "rmeeuws",
+                "timestamp": "2024-10-04T00:00:00",
+                "correlationId": "a03cd0c2-38b5-4619-b9e3-d6e5b842e127",
+                "metadataChanges": [
+                  {
+                    "fieldName": "taxCode",
+                    "oldValue": null,
+                    "newValue": "V21",
+                  }
+                ]
+              }
       responses:
         "201":
           description: Created
@@ -1157,7 +1287,6 @@ paths:
             type: string
             format: uuid
             example: 37a8095b-19db-498f-9349-5f37d21c5bdf
-          required: true
           description: The id of the source metadata.
         - in: query
           name: incomingName
@@ -1314,7 +1443,20 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/postMetadataAuditTrailRequest"
+              $ref: "#/components/schemas/unavailable"
+            example:
+              {
+                "user": "rmeeuws",
+                "timestamp": "2024-10-04T00:00:00",
+                "correlationId": "a03cd0c2-38b5-4619-b9e3-d6e5b842e127",
+                "metadataChanges": [
+                  {
+                    "fieldName": "businessOwner",
+                    "oldValue": "Corneel Verstoep",
+                    "newValue": "Mark Verheij",
+                  }
+                ]
+              }
       responses:
         "201":
           description: Created
@@ -1439,7 +1581,20 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/postMetadataAuditTrailRequest"
+              $ref: "#/components/schemas/unavailable"
+            example:
+              {
+                "user": "rmeeuws",
+                "timestamp": "2024-10-04T00:00:00",
+                "correlationId": "a03cd0c2-38b5-4619-b9e3-d6e5b842e127",
+                "metadataChanges": [
+                  {
+                    "fieldName": "isOpen",
+                    "oldValue": "true",
+                    "newValue": "false",
+                  }
+                ]
+              }
       responses:
         "201":
           description: Created
@@ -1460,7 +1615,6 @@ paths:
             type: string
             format: uuid
             example: 37a8095b-19db-498f-9349-5f37d21c5bdf
-          required: true
           description: The id of the concession metadata.
         - in: query
           name: concessionId
@@ -1594,7 +1748,20 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/postMetadataAuditTrailRequest"
+              $ref: "#/components/schemas/unavailable"
+            example:
+              {
+                "user": "rmeeuws",
+                "timestamp": "2024-10-04T00:00:00",
+                "correlationId": "a03cd0c2-38b5-4619-b9e3-d6e5b842e127",
+                "metadataChanges": [
+                  {
+                    "fieldName": "percentage",
+                    "oldValue": null,
+                    "newValue": "23.456",
+                  },
+                ],
+              }
       responses:
         "201":
           description: Created
@@ -1615,7 +1782,6 @@ paths:
             type: string
             format: uuid
             example: 37a8095b-19db-498f-9349-5f37d21c5bdf
-          required: true
           description: The id of the metadata audit trail.
         - in: query
           name: productMetadataId
@@ -1792,34 +1958,6 @@ components:
             example:
               - "/account/12345"
               - "/account/67890"
-    postMetadataAuditTrailRequest:
-      type: object
-      properties:
-        user:
-          type: string
-          example: rmeeuws
-        timestamp:
-          type: string
-          format: date-time
-          example: 2024-10-04T00:00:00
-        correlationId:
-          type: string
-          format: uuid
-          example: a03cd0c2-38b5-4619-b9e3-d6e5b842e127
-        metadataChanges:
-          type: array
-          items:
-            type: object
-            properties:
-              fieldName:
-                type: string
-                example: businessOwner
-              oldValue:
-                type: string
-                example: Corneel Verstoep
-              newValue:
-                type: string
-                example: Jan-Willem Vermeij
     postMetadataAuditTrailResponse:
       type: object
       properties: