Tyespec migration for Commerce

specification/commerce/resource-manager/Microsoft.Commerce/Commerce/back-compatible.tsp

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+import "@azure-tools/typespec-client-generator-core";
+
+using Azure.ClientGenerator.Core;
+using Microsoft.Commerce;
+
+#suppress "@azure-tools/typespec-azure-core/no-legacy-usage" "FIXME: Update justification, follow aka.ms/tsp/conversion-fix for details"
+@@Legacy.flattenProperty(UsageAggregation.properties);
+
+@@clientLocation(UsageAggregatesOperationGroup.list, "UsageAggregates");
+
+@@clientLocation(RateCardOperationGroup.get, "RateCard");

specification/commerce/resource-manager/Microsoft.Commerce/Commerce/client.tsp

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+import "./main.tsp";
+import "@azure-tools/typespec-client-generator-core";
+
+using Azure.ClientGenerator.Core;
+using Microsoft.Commerce;
+
+@@clientName(Microsoft.Commerce, "UsageManagementClient", "python, javascript");

specification/commerce/resource-manager/Microsoft.Commerce/Commerce/examples/2015-06-01-preview/GetRateCard.json

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+{
+  "parameters": {
+    "$filter": "OfferDurableId eq 'MS-AZR-0003P' and Currency eq 'USD' and Locale eq 'en-US' and RegionInfo eq 'US'",
+    "api-version": "2015-06-01-preview",
+    "subscriptionId": "6d61cc05-8f8f-4916-b1b9-f1d9c25aae27"
+  },
+  "title": "GetRateCard",
+  "responses": {
+    "200": {
+      "body": {
+        "Meters": [
+          {
+            "EffectiveDate": "2017-09-01T00:00:00Z",
+            "IncludedQuantity": 0,
+            "MeterCategory": "Test Category",
+            "MeterId": "1d7518e5-bc2f-4a93-9057-1b3047856645",
+            "MeterName": "Test Meter",
+            "MeterRates": {
+              "0": 1.99,
+              "100": 0.99
+            },
+            "MeterRegion": "US West",
+            "MeterSubCategory": "Test Subcategory",
+            "MeterTags": [
+              "Third Party"
+            ],
+            "Unit": "Hours"
+          }
+        ],
+        "OfferTerms": []
+      }
+    }
+  },
+  "operationId": "RateCard_Get"
+}

specification/commerce/resource-manager/Microsoft.Commerce/Commerce/examples/2015-06-01-preview/GetUsageAggregatesList.json

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+{
+  "parameters": {
+    "aggregationGranularity": "Daily",
+    "api-version": "2015-06-01-preview",
+    "reportedEndTime": "2015-06-01T00:00:00+00:00",
+    "reportedStartTime": "2014-05-01T00:00:00+00:00",
+    "showDetails": "true",
+    "subscriptionId": "f68815e6-3c41-45ef-bbd8-5f83303c396b"
+  },
+  "title": "GetUsageAggregatesList",
+  "responses": {
+    "200": {
+      "body": {
+        "value": [
+          {
+            "name": "Daily_BRSDT_20140501_0000",
+            "type": "Microsoft.Commerce/UsageAggregate",
+            "id": "/subscriptions/f68815e6-3c41-45ef-bbd8-5f83303c396b/providers/Microsoft.Commerce/UsageAggregates/Daily_BRSDT_20140501_0000",
+            "properties": {
+              "infoFields": {},
+              "meterCategory": "Storage",
+              "meterId": "0e9d0c9b-ab6d-4312-9c7e-3794e22af9c4",
+              "meterName": "Standard IO – Page Blob/Disk (GB)",
+              "meterSubCategory": "Geo Redundant",
+              "quantity": 0.057865,
+              "subscriptionId": "f68815e6-3c41-45ef-bbd8-5f83303c396b",
+              "unit": "GB",
+              "usageEndTime": "2015-03-04T00:00:00+00:00",
+              "usageStartTime": "2015-03-03T00:00:00+00:00"
+            }
+          }
+        ]
+      }
+    },
+    "202": {
+      "body": {
+        "error": {
+          "code": "aaaaaaaaaaaaaaaaaaaaaa",
+          "message": "aaaaaaaaaaaaaaaaaaaa"
+        }
+      }
+    }
+  },
+  "operationId": "UsageAggregates_List"
+}

specification/commerce/resource-manager/Microsoft.Commerce/Commerce/main.tsp

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+/**
+ * PLEASE DO NOT REMOVE - USED FOR CONVERTER METRICS
+ * Generated by package: @autorest/openapi-to-typespec
+ * Parameters used:
+ *   isFullCompatible: true
+ *   guessResourceKey: false
+ * Version: 0.11.12
+ * Date: 2025-12-12T02:06:35.769Z
+ */
+import "@typespec/rest";
+import "@typespec/versioning";
+import "@azure-tools/typespec-azure-core";
+import "@azure-tools/typespec-azure-resource-manager";
+import "./models.tsp";
+import "./back-compatible.tsp";
+import "./routes.tsp";
+
+using TypeSpec.Rest;
+using TypeSpec.Http;
+using Azure.ResourceManager.Foundations;
+using Azure.Core;
+using Azure.ResourceManager;
+using TypeSpec.Versioning;
+
+#suppress "@azure-tools/typespec-azure-resource-manager/missing-operations-endpoint" "FIXME: Update justification, follow aka.ms/tsp/conversion-fix for details"
+@armProviderNamespace
+@service(#{ title: "UsageManagementClient" })
+@versioned(Versions)
+// FIXME: Common type version not set. Set to v3.
+@armCommonTypesVersion(Azure.ResourceManager.CommonTypes.Versions.v3)
+namespace Microsoft.Commerce;
+
+/**
+ * The available API versions.
+ */
+enum Versions {
+  /**
+   * The 2015-06-01-preview API version.
+   */
+  v2015_06_01_preview: "2015-06-01-preview",
+}