diff --git a/apps/webhook_listeners/lib/Controller/WebhooksController.php b/apps/webhook_listeners/lib/Controller/WebhooksController.php
index eeb26b570309d..1d5e37cb373b0 100644
--- a/apps/webhook_listeners/lib/Controller/WebhooksController.php
+++ b/apps/webhook_listeners/lib/Controller/WebhooksController.php
@@ -247,7 +247,7 @@ public function update(
 	 *
 	 * @return DataResponse<Http::STATUS_OK, bool, array{}>
 	 *
-	 * 200: Boolean returned whether something was deleted FIXME
+	 * 200: Boolean returned whether something was deleted
 	 *
 	 * @throws OCSBadRequestException Bad request
 	 * @throws OCSForbiddenException Insufficient permissions
@@ -269,4 +269,34 @@ public function destroy(int $id): DataResponse {
 			throw new OCSException('An internal error occurred', Http::STATUS_INTERNAL_SERVER_ERROR, $e);
 		}
 	}
+
+	/**
+	 * Remove all existing webhook registration mapped to an AppAPI app id
+	 *
+	 * @param string $appid id of the app, as in the EX-APP-ID for creation
+	 *
+	 * @return DataResponse<Http::STATUS_OK, int, array{}>
+	 *
+	 * 200: Integer number of registrations deleted
+	 *
+	 * @throws OCSBadRequestException Bad request
+	 * @throws OCSForbiddenException Insufficient permissions
+	 * @throws OCSException Other error
+	 */
+	#[ApiRoute(verb: 'DELETE', url: '/api/v1/webhooks/byappid/{appid}')]
+	#[AuthorizedAdminSetting(settings:Admin::class)]
+	#[AppApiAdminAccessWithoutUser]
+	public function deleteByAppId(string $appid): DataResponse {
+		try {
+			$deletedCount = $this->mapper->deleteByAppId($appid);
+			return new DataResponse($deletedCount);
+		} catch (\UnexpectedValueException $e) {
+			throw new OCSBadRequestException($e->getMessage(), $e);
+		} catch (\DomainException $e) {
+			throw new OCSForbiddenException($e->getMessage(), $e);
+		} catch (\Exception $e) {
+			$this->logger->error('Error when deleting flows for app id ' . $appid, ['exception' => $e]);
+			throw new OCSException('An internal error occurred', Http::STATUS_INTERNAL_SERVER_ERROR, $e);
+		}
+	}
 }
diff --git a/apps/webhook_listeners/lib/Db/WebhookListenerMapper.php b/apps/webhook_listeners/lib/Db/WebhookListenerMapper.php
index a55a8c7f6a0b1..c0d96891ecc2b 100644
--- a/apps/webhook_listeners/lib/Db/WebhookListenerMapper.php
+++ b/apps/webhook_listeners/lib/Db/WebhookListenerMapper.php
@@ -159,6 +159,21 @@ public function deleteById(int $id): bool {
 		return ($qb->executeStatement() > 0);
 	}
 
+	/**
+	 * Delete all registrations made by the given appId
+	 *
+	 * @throws Exception
+	 * @return int number of registration deleted
+	 */
+	public function deleteByAppId(string $appId): int {
+		$qb = $this->db->getQueryBuilder();
+
+		$qb->delete($this->getTableName())
+			->where($qb->expr()->eq('app_id', $qb->createNamedParameter($appId, IQueryBuilder::PARAM_STR)));
+
+		return $qb->executeStatement();
+	}
+
 	/**
 	 * @throws Exception
 	 * @return list<string>
diff --git a/apps/webhook_listeners/openapi.json b/apps/webhook_listeners/openapi.json
index 7b6fdd6241f4d..fcd26efdf6d69 100644
--- a/apps/webhook_listeners/openapi.json
+++ b/apps/webhook_listeners/openapi.json
@@ -686,7 +686,7 @@
                 ],
                 "responses": {
                     "200": {
-                        "description": "Boolean returned whether something was deleted FIXME",
+                        "description": "Boolean returned whether something was deleted",
                         "content": {
                             "application/json": {
                                 "schema": {
@@ -773,6 +773,134 @@
                     }
                 }
             }
+        },
+        "/ocs/v2.php/apps/webhook_listeners/api/v1/webhooks/byappid/{appid}": {
+            "delete": {
+                "operationId": "webhooks-delete-by-app-id",
+                "summary": "Remove all existing webhook registration mapped to an AppAPI app id",
+                "description": "This endpoint requires admin access",
+                "tags": [
+                    "webhooks"
+                ],
+                "security": [
+                    {
+                        "bearer_auth": []
+                    },
+                    {
+                        "basic_auth": []
+                    }
+                ],
+                "parameters": [
+                    {
+                        "name": "appid",
+                        "in": "path",
+                        "description": "id of the app, as in the EX-APP-ID for creation",
+                        "required": true,
+                        "schema": {
+                            "type": "string"
+                        }
+                    },
+                    {
+                        "name": "OCS-APIRequest",
+                        "in": "header",
+                        "description": "Required to be true for the API request to pass",
+                        "required": true,
+                        "schema": {
+                            "type": "boolean",
+                            "default": true
+                        }
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "Integer number of registrations deleted",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "type": "object",
+                                    "required": [
+                                        "ocs"
+                                    ],
+                                    "properties": {
+                                        "ocs": {
+                                            "type": "object",
+                                            "required": [
+                                                "meta",
+                                                "data"
+                                            ],
+                                            "properties": {
+                                                "meta": {
+                                                    "$ref": "#/components/schemas/OCSMeta"
+                                                },
+                                                "data": {
+                                                    "type": "integer",
+                                                    "format": "int64"
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    },
+                    "400": {
+                        "description": "Bad request",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "type": "object",
+                                    "required": [
+                                        "ocs"
+                                    ],
+                                    "properties": {
+                                        "ocs": {
+                                            "type": "object",
+                                            "required": [
+                                                "meta",
+                                                "data"
+                                            ],
+                                            "properties": {
+                                                "meta": {
+                                                    "$ref": "#/components/schemas/OCSMeta"
+                                                },
+                                                "data": {}
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    },
+                    "403": {
+                        "description": "Insufficient permissions",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "type": "object",
+                                    "required": [
+                                        "ocs"
+                                    ],
+                                    "properties": {
+                                        "ocs": {
+                                            "type": "object",
+                                            "required": [
+                                                "meta",
+                                                "data"
+                                            ],
+                                            "properties": {
+                                                "meta": {
+                                                    "$ref": "#/components/schemas/OCSMeta"
+                                                },
+                                                "data": {}
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
         }
     },
     "tags": []