diff --git a/src/openapi/customers/SE-customers.yaml b/src/openapi/customers/SE-customers.yaml
index 59269f4..24e3b5a 100644
--- a/src/openapi/customers/SE-customers.yaml
+++ b/src/openapi/customers/SE-customers.yaml
@@ -2044,8 +2044,9 @@ paths:
           type: integer
           example: 1
     post:
-      summary: Transfer old OVpay token to new OVpay token.
+      summary: "**INTEGRATIELAAG** Transfer old OVpay token to new OVpay token."
       description: |-
+        **Note that this is an integratielaag endpoint, not a service eninge endpoint!**
         Transfers all products, e-purse and personal account data of an existing OVpay token 
         to a new OVpay token. The new token will also be persisted in the profile as a replacement
         of the old token.
@@ -2172,6 +2173,163 @@ paths:
                             },
                         },
                     }
+        "404":
+          description: Not found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/unavailable"
+              examples:
+                Old token not found in profile:
+                  value:
+                    {
+                      "type": "https://htm.nl/api/v1/probs/notfound",
+                      "title": "The item you requested was not found.",
+                      "detail": "The old token was not found in the customer profile.",
+                      "instance": "urn:uuid:4017fabc-1b28-11e8-accf-0ed5f89f718b",
+                      "errors":
+                        [
+                          {
+                            "detail": "The old token was not found in the customer profile.",
+                            "pointer": "#/0/ovPayTokenId",
+                            "ovPayTokenId": 123,
+                          },
+                        ],
+                    }
+                New token not found in profile:
+                  value:
+                    {
+                      "type": "https://htm.nl/api/v1/probs/notfound",
+                      "title": "The item you requested was not found.",
+                      "detail": "The new token was not found in the customer profile.",
+                      "instance": "urn:uuid:4017fabc-1b28-11e8-accf-0ed5f89f718b",
+                      "errors":
+                        [
+                          {
+                            "detail": "The new token was not found in the customer profile.",
+                            "pointer": "#/0/ovPayTokenId",
+                            "ovPayTokenId": 123,
+                          },
+                        ],
+                    }
+                XTAT for new token not found in GBO:
+                  value:
+                    {
+                      "type": "https://htm.nl/api/v1/probs/notfound",
+                      "title": "The item you requested was not found.",
+                      "detail": "The new token was not found in GBO:.",
+                      "instance": "urn:uuid:4017fabc-1b28-11e8-accf-0ed5f89f718b",
+                      "errors":
+                        [
+                          {
+                            "detail": "XTAT for the new token was not found in GBO.",
+                            "pointer": "#/0/xtat",
+                            "xtat": "e35977b2-52bb-48ef-aca8-297b2c1d5058",
+                          },
+                        ],
+                    }
+                SRID for new token not found in GBO:
+                  value:
+                    {
+                      "type": "https://htm.nl/api/v1/probs/notfound",
+                      "title": "The item you requested was not found.",
+                      "detail": "The new token was not found in GBO:.",
+                      "instance": "urn:uuid:4017fabc-1b28-11e8-accf-0ed5f89f718b",
+                      "errors":
+                        [
+                          {
+                            "detail": "Service Reference ID for the new token was not found in GBO.",
+                            "pointer": "#/0/serviceReferenceId",
+                            "serviceReferenceId": "NLOV1234567ABCDEFG",
+                          },
+                        ],
+                    }
+        "405":
+          description: Not allowed
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/unavailable"
+              examples:
+                Old token is wrong token type:
+                  value:
+                    {
+                      "type": "https://htm.nl/api/v1/probs/notallowed",
+                      "title": "The transfer you requested was not allowed.",
+                      "detail": "The old token has wrong token type.",
+                      "instance": "urn:uuid:4017fabc-1b28-11e8-accf-0ed5f89f718b",
+                      "errors":
+                        [
+                          {
+                            "detail": "The old token has token type OV-pas physical.",
+                            "pointer": "#/0/ovPayToken/tokenTypeId",
+                            "tokenTypeId": 2,
+                          },
+                        ],
+                    }
+                Old token has wrong token status:
+                  value:
+                    {
+                      "type": "https://htm.nl/api/v1/probs/notallowed",
+                      "title": "The transfer you requested was not allowed.",
+                      "detail": "The old token has wrong token status.",
+                      "instance": "urn:uuid:4017fabc-1b28-11e8-accf-0ed5f89f718b",
+                      "errors":
+                        [
+                          {
+                            "detail": "The old token has token status replaced.",
+                            "pointer": "#/0/ovPayToken/tokenStatusId",
+                            "tokenStatusId": 4,
+                          },
+                        ],
+                    }
+                New token is expired:
+                  value:
+                    {
+                      "type": "https://htm.nl/api/v1/probs/notallowed",
+                      "title": "The transfer you requested was not allowed.",
+                      "detail": "The new token is expired.",
+                      "instance": "urn:uuid:4017fabc-1b28-11e8-accf-0ed5f89f718b",
+                      "errors":
+                        [
+                          {
+                            "detail": "The new token is expired.",
+                            "pointer": "#/0/ovPayToken/expirationDate",
+                            "experiationDate": 2022-01-01,
+                          },
+                        ],
+                    }
+                One or more GBO product instances not transferable:
+                  value:
+                    {
+                      "type": "https://htm.nl/api/v1/probs/notallowed",
+                      "title": "The transfer you requested was not allowed.",
+                      "detail": "One or more GBO product instances are not transferable.",
+                      "instance": "urn:uuid:4017fabc-1b28-11e8-accf-0ed5f89f718b",
+                      "errors":
+                        [
+                          {
+                            "detail": "One or more GBO product instances are not transferable",
+                            "pointer": "#/0/ovPayToken/packageTemplateId",
+                            "packageTemplateId": "33613",
+                          },
+                        ],
+                    }
+                One or more PAD attributes marked:
+                  value:
+                    {
+                      "type": "https://htm.nl/api/v1/probs/notallowed",
+                      "title": "The transfer you requested was not allowed.",
+                      "detail": "One or more PAD attributes are not transferable.",
+                      "instance": "urn:uuid:4017fabc-1b28-11e8-accf-0ed5f89f718b",
+                      "errors":
+                        [
+                          {
+                            "detail": "PAD attribute birthdate is marked on the old token",
+                            "pointer": "#/0/ovPayToken/padAttributes/birthdate",
+                          },
+                        ],
+                    }
 components:
   schemas:
     unavailable: