diff --git a/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/examples/createLegacySubscription.json b/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/examples/createLegacySubscription.json
index e0e193269f79..65ad499728a9 100644
--- a/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/examples/createLegacySubscription.json
+++ b/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/examples/createLegacySubscription.json
@@ -12,13 +12,7 @@
         {
           "objectId": "67439a9e-8519-4016-a630-f5f805eba567"
         }
-      ],
-      "additionalParameters": {
-        "customData": {
-          "key1": "value1",
-          "key2": true
-        }
-      }
+      ]
     }
   },
   "responses": {
diff --git a/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/examples/createSubscription.json b/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/examples/createSubscription.json
index 366082444c31..84f6fd17ba23 100644
--- a/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/examples/createSubscription.json
+++ b/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/examples/createSubscription.json
@@ -6,7 +6,6 @@
     "api-version": "2019-10-01-preview",
     "body": {
       "displayName": "Contoso MCA subscription",
-      "billingProfileId": "/providers/Microsoft.Billing/billingAccounts/0aa27f2b-ec7f-5a65-71f6-a5ff0897bd55:ae0dae1e-de9a-41f6-8257-76b055d98372_2019-05-31/billingProfiles/27VR-HDWX-BG7-TGB",
       "skuId": "0001",
       "costCenter": "135366376",
       "owner": {
diff --git a/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/subscriptions.json b/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/subscriptions.json
index 7d9d0a2b8f94..a065c890aa85 100644
--- a/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/subscriptions.json
+++ b/specification/subscription/resource-manager/Microsoft.Subscription/preview/2019-10-01-preview/subscriptions.json
@@ -542,13 +542,6 @@
             "MS-AZR-0017P",
             "MS-AZR-0148P"
           ]
-        },
-        "additionalParameters": {
-          "description": "Additional, untyped parameters to support custom subscription creation scenarios.",
-          "type": "object",
-          "additionalProperties": {
-            "type": "object"
-          }
         }
       }
     },
@@ -556,7 +549,6 @@
       "description": "The parameters required to create a new subscription.",
       "required": [
         "displayName",
-        "billingProfileId",
         "skuId"
       ],
       "properties": {
@@ -564,10 +556,6 @@
           "description": "The friendly name of the subscription.",
           "type": "string"
         },
-        "billingProfileId": {
-          "description": "The ARM ID of the billing profile for which you want to create the subscription.",
-          "type": "string"
-        },
         "skuId": {
           "description": "The SKU ID of the Azure plan. Azure plan determines the pricing and service-level agreement of the subscription.  Use 001 for Microsoft Azure Plan and 002 for Microsoft Azure Plan for DevTest.",
           "type": "string"
@@ -583,13 +571,6 @@
         "managementGroupId": {
           "description": "The identifier of the management group to which this subscription will be associated.",
           "type": "string"
-        },
-        "additionalParameters": {
-          "description": "Additional, untyped parameters to support custom subscription creation scenarios.",
-          "type": "object",
-          "additionalProperties": {
-            "type": "object"
-          }
         }
       }
     },
@@ -611,10 +592,6 @@
         "resellerId": {
           "description": "Reseller ID, basically MPN Id.",
           "type": "string"
-        },
-        "serviceProviderId": {
-          "description": "Service provider ID, basically MPN Id.",
-          "type": "string"
         }
       }
     }