diff --git a/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/agfood.json b/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/agfood.json
index 699431e30fb5..faec8934cbc8 100644
--- a/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/agfood.json
+++ b/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/agfood.json
@@ -11,8 +11,11 @@
         "tags": [
           "Extensions"
         ],
-        "description": "Install extension.",
-        "operationId": "Extensions_Create",
+        "description": "Install or Update extension.",
+        "operationId": "Extensions_CreateOrUpdate",
+        "consumes": [
+          "application/json"
+        ],
         "produces": [
           "application/json"
         ],
@@ -31,15 +34,29 @@
           },
           {
             "$ref": "../../../../../common-types/resource-management/v3/types.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "in": "body",
+            "name": "requestBody",
+            "description": "Extension resource request body.",
+            "schema": {
+              "$ref": "#/definitions/ExtensionInstallationRequest"
+            }
           }
         ],
         "responses": {
-          "201": {
+          "200": {
             "description": "Success",
             "schema": {
               "$ref": "#/definitions/Extension"
             }
           },
+          "201": {
+            "description": "Created",
+            "schema": {
+              "$ref": "#/definitions/Extension"
+            }
+          },
           "default": {
             "description": "Error",
             "schema": {
@@ -48,8 +65,8 @@
           }
         },
         "x-ms-examples": {
-          "Extensions_Create": {
-            "$ref": "./examples/Extensions_Create.json"
+          "Extensions_CreateOrUpdate": {
+            "$ref": "./examples/Extensions_CreateOrUpdate.json"
           }
         }
       },
@@ -99,52 +116,6 @@
           }
         }
       },
-      "patch": {
-        "tags": [
-          "Extensions"
-        ],
-        "description": "Upgrade to latest extension.",
-        "operationId": "Extensions_Update",
-        "produces": [
-          "application/json"
-        ],
-        "parameters": [
-          {
-            "$ref": "../../../../../common-types/resource-management/v3/types.json#/parameters/SubscriptionIdParameter"
-          },
-          {
-            "$ref": "../../../../../common-types/resource-management/v3/types.json#/parameters/ResourceGroupNameParameter"
-          },
-          {
-            "$ref": "#/parameters/FarmBeatsResourceNameParameter"
-          },
-          {
-            "$ref": "#/parameters/ExtensionIdParameter"
-          },
-          {
-            "$ref": "../../../../../common-types/resource-management/v3/types.json#/parameters/ApiVersionParameter"
-          }
-        ],
-        "responses": {
-          "200": {
-            "description": "Success",
-            "schema": {
-              "$ref": "#/definitions/Extension"
-            }
-          },
-          "default": {
-            "description": "Error",
-            "schema": {
-              "$ref": "../../../../../common-types/resource-management/v3/types.json#/definitions/ErrorResponse"
-            }
-          }
-        },
-        "x-ms-examples": {
-          "Extensions_Update": {
-            "$ref": "./examples/Extensions_Update.json"
-          }
-        }
-      },
       "delete": {
         "tags": [
           "Extensions"
@@ -1233,6 +1204,19 @@
     }
   },
   "definitions": {
+    "ApiProperties": {
+      "description": "Api properties.",
+      "type": "object",
+      "properties": {
+        "apiFreshnessWindow": {
+          "format": "int32",
+          "description": "Iterval in seconds for which the weather data for the api needs to be refreshed.",
+          "maximum": 3600,
+          "minimum": 0,
+          "type": "integer"
+        }
+      }
+    },
     "ExtensionProperties": {
       "description": "Extension resource properties.",
       "type": "object",
@@ -1290,6 +1274,29 @@
       },
       "x-ms-azure-resource": true
     },
+    "ExtensionInstallationRequest": {
+      "description": "Extension Installation Request Body.",
+      "required": [
+        "apiProperties"
+      ],
+      "type": "object",
+      "properties": {
+        "extensionVersion": {
+          "description": "Extension Version.",
+          "default": null,
+          "maxLength": 10,
+          "minLength": 3,
+          "type": "string"
+        },
+        "apiProperties": {
+          "description": "Api Properties.",
+          "type": "object",
+          "additionalProperties": {
+            "$ref": "#/definitions/ApiProperties"
+          }
+        }
+      }
+    },
     "ExtensionListResponse": {
       "description": "Paged response contains list of requested objects and a URL link to get the next set of results.",
       "type": "object",
diff --git a/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/examples/Extensions_Create.json b/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/examples/Extensions_Create.json
deleted file mode 100644
index 94648abfe0f5..000000000000
--- a/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/examples/Extensions_Create.json
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  "parameters": {
-    "api-version": "2021-09-01-preview",
-    "subscriptionId": "11111111-2222-3333-4444-555555555555",
-    "resourceGroupName": "examples-rg",
-    "farmBeatsResourceName": "examples-farmbeatsResourceName",
-    "extensionId": "provider.extension"
-  },
-  "responses": {
-    "201": {
-      "body": {
-        "id": "/subscriptions/11111111-2222-3333-4444-555555555555/resourceGroups/examples-rg/Microsoft.AgFoodPlatform/farmBeats/examples-farmbeatsResourceName/extensions/provider.extension",
-        "name": "provider.extension",
-        "type": "Microsoft.AgFoodPlatform/farmBeats/extensions",
-        "systemData": {
-          "createdBy": "string",
-          "createdByType": "User",
-          "createdAt": "2020-02-01T01:01:01.1075056Z",
-          "lastModifiedBy": "string",
-          "lastModifiedByType": "User",
-          "lastModifiedAt": "2020-02-01T01:01:01.1075056Z"
-        },
-        "eTag": "7200b954-0000-0700-0000-603cbbc40000",
-        "properties": {
-          "extensionCategory": "Weather",
-          "installedExtensionVersion": "1.0",
-          "extensionAuthLink": "https://www.provider.com/extension/",
-          "extensionApiDocsLink": "https://docs.provider.com/documentation/extension"
-        }
-      }
-    }
-  }
-}
diff --git a/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/examples/Extensions_Update.json b/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/examples/Extensions_Update.json
deleted file mode 100644
index aac8522bf990..000000000000
--- a/specification/agrifood/resource-manager/Microsoft.AgFoodPlatform/preview/2021-09-01-preview/examples/Extensions_Update.json
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  "parameters": {
-    "api-version": "2021-09-01-preview",
-    "subscriptionId": "11111111-2222-3333-4444-555555555555",
-    "resourceGroupName": "examples-rg",
-    "farmBeatsResourceName": "examples-farmbeatsResourceName",
-    "extensionId": "provider.extension"
-  },
-  "responses": {
-    "200": {
-      "body": {
-        "id": "/subscriptions/11111111-2222-3333-4444-555555555555/resourceGroups/examples-rg/Microsoft.AgFoodPlatform/farmBeats/examples-farmbeatsResourceName/extensions/provider.extension",
-        "name": "provider.extension",
-        "type": "Microsoft.AgFoodPlatform/farmBeats/extensions",
-        "systemData": {
-          "createdBy": "string",
-          "createdByType": "User",
-          "createdAt": "2020-02-01T01:01:01.1075056Z",
-          "lastModifiedBy": "string",
-          "lastModifiedByType": "User",
-          "lastModifiedAt": "2020-02-01T01:01:01.1075056Z"
-        },
-        "eTag": "7200b954-0000-0700-0000-603cbbc40000",
-        "properties": {
-          "extensionCategory": "Weather",
-          "installedExtensionVersion": "2.0",
-          "extensionAuthLink": "https://www.provider.com/extension/",
-          "extensionApiDocsLink": "https://docs.provider.com/documentation/extension"
-        }
-      }
-    }
-  }
-}