diff --git a/dictation_server/src/api/odms/openapi.json b/dictation_server/src/api/odms/openapi.json
index 7331140..fc93bd5 100644
--- a/dictation_server/src/api/odms/openapi.json
+++ b/dictation_server/src/api/odms/openapi.json
@@ -1218,6 +1218,71 @@
           }
         ]
       }
+    },
+    "/licenses/orders": {
+      "post": {
+        "operationId": "signup",
+        "summary": "",
+        "parameters": [],
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/CreateOrdersRequest"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "成功時のレスポンス",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/CreateOrdersResponse"
+                }
+              }
+            }
+          },
+          "400": {
+            "description": "同一PONumberの注文がすでに存在する場合など",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "認証エラー",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "想定外のサーバーエラー",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          }
+        },
+        "tags": ["licenses"],
+        "security": [
+          {
+            "bearer": []
+          }
+        ]
+      }
     }
   },
   "info": {
@@ -1867,6 +1932,22 @@
       "RegisterResponse": {
         "type": "object",
         "properties": {}
+      },
+      "CreateOrdersRequest": {
+        "type": "object",
+        "properties": {
+          "poNumber": {
+            "type": "string"
+          },
+          "orderCount": {
+            "type": "number"
+          }
+        },
+        "required": ["poNumber", "orderCount"]
+      },
+      "CreateOrdersResponse": {
+        "type": "object",
+        "properties": {}
       }
     }
   }