diff --git a/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/costmanagement.json b/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/costmanagement.json
index 699141844f71..2193dca44ff3 100644
--- a/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/costmanagement.json
+++ b/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/costmanagement.json
@@ -1417,6 +1417,51 @@
         }
       }
     },
+    "/providers/Microsoft.CostManagement/checkConnectorEligibility": {
+      "post": {
+        "tags": [
+          "CheckConnectorEligibility"
+        ],
+        "operationId": "Connector_CheckEligibility",
+        "description": "Check if a connector already exists and return it's definition",
+        "externalDocs": {
+          "url": "https://docs.microsoft.com/en-us/rest/api/costmanagement/"
+        },
+        "x-ms-examples": {
+          "CheckEligibility_Post": {
+            "$ref": "./examples/CheckEligibilityPost.json"
+          }
+        },
+        "parameters": [
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          },
+          {
+            "name": "connectorCredentials",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/CheckEligibilityDefinition"
+            },
+            "description": "Connector credentials"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK. The request has succeeded.",
+            "schema": {
+              "$ref": "#/definitions/ConnectorDefinition"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        }
+      }
+    },
     "/providers/Microsoft.CostManagement/externalBillingAccounts": {
       "get": {
         "tags": [
@@ -2618,6 +2663,42 @@
         }
       }
     },
+    "CheckEligibilityDefinition": {
+      "type": "object",
+      "description": "The check eligibility Connector credentials definition",
+      "properties": {
+        "kind": {
+          "type": "string",
+          "description": "Connector kind (eg aws)"
+        },
+        "credentialsKey": {
+          "type": "string",
+          "x-ms-mutability": [
+            "read",
+            "create",
+            "update"
+          ],
+          "description": "Credentials authentication key (eg AWS ARN)"
+        },
+        "credentialsSecret": {
+          "type": "string",
+          "x-ms-mutability": [
+            "create",
+            "update"
+          ],
+          "description": "Credentials secret (eg AWS ExternalId)"
+        },
+        "reportId": {
+          "type": "string",
+          "x-ms-mutability": [
+            "read",
+            "create",
+            "update"
+          ],
+          "description": "Identifying source report. (For AWS this is a CUR report name, defined with Daily and with Resources)"
+        }
+      }
+    },
     "ExternalBillingAccountDefinitionListResult": {
       "description": "Result of listing ExternalBillingAccount definitions. It contains a list of available ExternalBillingAccount definitions in the scope provided.",
       "properties": {
diff --git a/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/examples/CheckEligibilityPost.json b/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/examples/CheckEligibilityPost.json
new file mode 100644
index 000000000000..fabd1d2eddcf
--- /dev/null
+++ b/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/examples/CheckEligibilityPost.json
@@ -0,0 +1,35 @@
+{
+  "parameters": {
+    "api-version": "2019-03-01-preview",
+    "connectorCredentials": {
+      "kind": "aws",
+      "credentialsKey": "arn:aws:iam::123456789012:role/AzureCostManagementRole",
+      "credentialsSecret": "external-id",
+      "reportId": "HourlyWithResources"
+    }
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "kind": "aws",
+        "id": "/providers/Microsoft.CostManagement/cloudConnectors/aws-123456789012",
+        "name": "aws-123456789012",
+        "type": "Microsoft.CostManagement/cloudConnectors",
+        "properties": {
+          "displayName": "AWS-Consolidated-1",
+          "providerBillingAccountId": "123456789012",
+          "credentialsKey": "arn:aws:iam::123456789012:role/AzureCostManagementRole",
+          "reportId": "HourlyWithResources",
+          "createdOn": "2018-05-15T13:25:48Z",
+          "modifiedOn": "2018-05-23T09:21:11Z",
+          "status": "active",
+          "externalBillingAccountId": "/providers/Microsoft.CostManagement/externalBillingAccounts/aws-123456789012",
+          "defaultManagementGroupId": "/providers/Microsoft.Management/managementGroups/XYZ",
+          "subscriptionId": "22222222-3333-4444-1111-777777777777",
+          "billingModel": "autoUpgrade",
+          "daysTrialRemaining": 62
+        }
+      }
+    }
+  }
+}
diff --git a/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/examples/ShowbackRulePut.json b/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/examples/ShowbackRulePut.json
index 010f490e8cea..b5cb7c3b4555 100644
--- a/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/examples/ShowbackRulePut.json
+++ b/specification/cost-management/resource-manager/Microsoft.CostManagement/preview/2019-03-01-preview/examples/ShowbackRulePut.json
@@ -4,7 +4,6 @@
     "billingAccountId": "100",
     "ruleName": "testRule",
     "showbackRule": {
-      "name": "demo",
       "properties": {
         "description": "Welcome to Showback demo",
         "status": "Active",