diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/billing.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/billing.json
index 3f7c002c9e65..6ddd185c5de4 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/billing.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/billing.json
@@ -6249,12 +6249,42 @@
           }
         },
         "amountDue": {
-          "description": "Amount due.",
+          "description": "The amount due as of now.",
+          "readOnly": true,
+          "$ref": "#/definitions/Amount"
+        },
+        "azurePrepaymentApplied": {
+          "description": "The amount of Azure prepayment applied to the charges. This field is applicable to billing accounts with agreement type Microsoft Customer Agreement.",
           "readOnly": true,
           "$ref": "#/definitions/Amount"
         },
         "billedAmount": {
-          "description": "Amount billed.",
+          "description": "The total charges for the invoice billing period.",
+          "readOnly": true,
+          "$ref": "#/definitions/Amount"
+        },
+        "creditAmount": {
+          "description": "The total refund for returns and cancellations during the invoice billing period. This field is applicable to billing accounts with agreement type Microsoft Customer Agreement.",
+          "readOnly": true,
+          "$ref": "#/definitions/Amount"
+        },
+        "freeAzureCreditApplied": {
+          "description": "The amount of free Azure credits applied to the charges. This field is applicable to billing accounts with agreement type Microsoft Customer Agreement.",
+          "readOnly": true,
+          "$ref": "#/definitions/Amount"
+        },
+        "subTotal": {
+          "description": "The pre-tax amount due. This field is applicable to billing accounts with agreement type Microsoft Customer Agreement.",
+          "readOnly": true,
+          "$ref": "#/definitions/Amount"
+        },
+        "taxAmount": {
+          "description": "The amount of tax charged for the billing period. This field is applicable to billing accounts with agreement type Microsoft Customer Agreement.",
+          "readOnly": true,
+          "$ref": "#/definitions/Amount"
+        },
+        "totalAmount": {
+          "description": "The amount due when the invoice was generated. This field is applicable to billing accounts with agreement type Microsoft Customer Agreement.",
           "readOnly": true,
           "$ref": "#/definitions/Amount"
         },
@@ -6283,6 +6313,11 @@
             "modelAsString": true
           }
         },
+        "isMonthlyInvoice": {
+          "description": "Specifies if the invoice is generated as part of monthly invoicing cycle or not. This field is applicable to billing accounts with agreement type Microsoft Customer Agreement.",
+          "type": "boolean",
+          "readOnly": true
+        },
         "billingProfileId": {
           "description": "The billing profile id this invoice belongs to.",
           "type": "string",
@@ -6294,7 +6329,7 @@
           "readOnly": true
         },
         "purchaseOrderNumber": {
-          "description": "The purchase identifier for the invoice.",
+          "description": "An optional purchase order number used for the invoice.",
           "type": "string",
           "readOnly": true
         },
@@ -7453,6 +7488,34 @@
           "type": "string",
           "readOnly": true
         },
+        "category": {
+          "type": "string",
+          "description": "Category of the agreement signed by customer.",
+          "readOnly": true,
+          "enum": [
+            "MicrosoftCustomerAgreement",
+            "AffiliatePurchaseTerms",
+            "Other"
+          ],
+          "x-ms-enum": {
+            "name": "category",
+            "modelAsString": true
+          }
+        },
+        "acceptanceMode": {
+          "type": "string",
+          "description": "The mode of acceptance for an agreement.",
+          "readOnly": true,
+          "enum": [
+            "ClickToAccept",
+            "ESignEmbedded",
+            "ESignOffline"
+          ],
+          "x-ms-enum": {
+            "name": "acceptanceMode",
+            "modelAsString": true
+          }
+        },
         "effectiveDate": {
           "description": "Effective date.",
           "type": "string",
diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/AgreementByName.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/AgreementByName.json
index a74474b993f3..e3091a49eb3a 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/AgreementByName.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/AgreementByName.json
@@ -12,6 +12,8 @@
         "type": "Microsoft.Billing/billingAccounts/agreements",
         "properties": {
           "agreementLink": "https://agreementuri1.com",
+          "category": "MicrosoftCustomerAgreement",
+          "acceptanceMode": "ClickToAccept",
           "effectiveDate": "2018-12-05T00:00:00Z",
           "expirationDate": "2018-12-05T00:00:00Z",
           "participants": [
diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/AgreementsListByBillingAccount.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/AgreementsListByBillingAccount.json
index 7858b33f3449..2316d74cb00d 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/AgreementsListByBillingAccount.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/AgreementsListByBillingAccount.json
@@ -13,6 +13,8 @@
             "type": "Microsoft.Billing/billingAccounts/agreements",
             "properties": {
               "agreementLink": "https://agreementuri1.com",
+              "category": "MicrosoftCustomerAgreement",
+              "acceptanceMode": "ClickToAccept",
               "effectiveDate": "2018-12-05T00:00:00Z",
               "expirationDate": "2018-12-05T00:00:00Z",
               "participants": [
@@ -36,6 +38,8 @@
             "type": "Microsoft.Billing/billingAccounts/agreements",
             "properties": {
               "agreementLink": "https://agreementuri2.com",
+              "category": "MicrosoftCustomerAgreement",
+              "acceptanceMode": "ESignEmbedded",
               "effectiveDate": "2018-12-05T00:00:00Z",
               "expirationDate": "2018-12-05T00:00:00Z",
               "participants": [
diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/BillingAccountInvoicesList.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/BillingAccountInvoicesList.json
index a95b433064d3..8cae9ef48c9d 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/BillingAccountInvoicesList.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/BillingAccountInvoicesList.json
@@ -20,14 +20,39 @@
               "status": "Due",
               "amountDue": {
                 "currency": "USD",
-                "value": 2000.00
+                "value": 8.53
               },
               "billedAmount": {
                 "currency": "USD",
-                "value": 2000.00
+                "value": 33.99
+              },
+              "azurePrepaymentApplied": {
+                "currency": "USD",
+                "value": 25.46
+              },
+              "creditAmount": {
+                "currency": "USD",
+                "value": 1.00
+              },
+              "freeAzureCreditApplied": {
+                "currency": "USD",
+                "value": 0.00
+              },
+              "subTotal": {
+                "currency": "USD",
+                "value": 33.99
+              },
+              "taxAmount": {
+                "currency": "USD",
+                "value": 0.00
+              },
+              "totalAmount": {
+                "currency": "USD",
+                "value": 7.53
               },
               "invoicePeriodStartDate": "2018-01-01T17:32:28Z",
               "invoicePeriodEndDate": "2018-01-15T17:32:28Z",
+              "isMonthlyInvoice": false,
               "billingProfileId": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/11000000-0000-0000-0000-000000000000",
               "billingProfileDisplayName": "Contoso Operations Billing",
               "purchaseOrderNumber": "123456",
@@ -43,7 +68,7 @@
                   "paymentType": "credited",
                   "amount": {
                     "currency": "USD",
-                    "value": 2000.00
+                    "value": 1.00
                   },
                   "paymentMethodFamily": "CreditCard",
                   "paymentMethodType": "visa"
@@ -61,14 +86,39 @@
               "status": "PastDue",
               "amountDue": {
                 "currency": "USD",
-                "value": 2000.00
+                "value": 16.53
               },
               "billedAmount": {
                 "currency": "USD",
-                "value": 2000.00
+                "value": 33.99
+              },
+              "azurePrepaymentApplied": {
+                "currency": "USD",
+                "value": 15.46
+              },
+              "creditAmount": {
+                "currency": "USD",
+                "value": 2.00
+              },
+              "freeAzureCreditApplied": {
+                "currency": "USD",
+                "value": 0.00
+              },
+              "subTotal": {
+                "currency": "USD",
+                "value": 33.99
+              },
+              "taxAmount": {
+                "currency": "USD",
+                "value": 0.00
+              },
+              "totalAmount": {
+                "currency": "USD",
+                "value": 16.53
               },
               "invoicePeriodStartDate": "2018-02-01T17:32:28Z",
-              "invoicePeriodEndDate": "2018-02-30T17:32:28Z",
+              "invoicePeriodEndDate": "2018-02-28T17:32:28Z",
+              "isMonthlyInvoice": true,
               "billingProfileId": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/11000000-0000-0000-0000-000000000000",
               "billingProfileDisplayName": "Contoso Operations Billing",
               "purchaseOrderNumber": "123456",
@@ -84,7 +134,7 @@
                   "paymentType": "credited",
                   "amount": {
                     "currency": "USD",
-                    "value": 2000.00
+                    "value": 2.00
                   },
                   "paymentMethodFamily": "CreditCard",
                   "paymentMethodType": "visa"
diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/Invoice.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/Invoice.json
index 094ddb082c5a..92805185cb6b 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/Invoice.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/Invoice.json
@@ -17,14 +17,39 @@
           "status": "Due",
           "amountDue": {
             "currency": "USD",
-            "value": 2000.00
+            "value": 16.53
           },
           "billedAmount": {
             "currency": "USD",
-            "value": 2000.00
+            "value": 33.99
+          },
+          "azurePrepaymentApplied": {
+            "currency": "USD",
+            "value": 15.46
+          },
+          "creditAmount": {
+            "currency": "USD",
+            "value": 2.00
+          },
+          "freeAzureCreditApplied": {
+            "currency": "USD",
+            "value": 0.00
+          },
+          "subTotal": {
+            "currency": "USD",
+            "value": 33.99
+          },
+          "taxAmount": {
+            "currency": "USD",
+            "value": 0.00
+          },
+          "totalAmount": {
+            "currency": "USD",
+            "value": 16.53
           },
           "invoicePeriodStartDate": "2018-01-01T17:32:28Z",
           "invoicePeriodEndDate": "2018-01-15T17:32:28Z",
+          "isMonthlyInvoice": false,
           "billingProfileId": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/{billingProfileName}",
           "billingProfileDisplayName": "Contoso Operations Billing",
           "purchaseOrderNumber": "123456",
@@ -48,7 +73,7 @@
               "paymentType": "credited",
               "amount": {
                 "currency": "USD",
-                "value": 2000.00
+                "value": 2.00
               },
               "paymentMethodFamily": "CreditCard",
               "paymentMethodType": "visa"
diff --git a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/InvoicesListByBillingProfile.json b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/InvoicesListByBillingProfile.json
index ebddfc84b77b..6867b5848080 100644
--- a/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/InvoicesListByBillingProfile.json
+++ b/specification/billing/resource-manager/Microsoft.Billing/preview/2019-10-01-preview/examples/InvoicesListByBillingProfile.json
@@ -21,14 +21,39 @@
               "status": "Due",
               "amountDue": {
                 "currency": "USD",
-                "value": 2000.00
+                "value": 8.53
               },
               "billedAmount": {
                 "currency": "USD",
-                "value": 2000.00
+                "value": 33.99
+              },
+              "azurePrepaymentApplied": {
+                "currency": "USD",
+                "value": 25.46
+              },
+              "creditAmount": {
+                "currency": "USD",
+                "value": 1.00
+              },
+              "freeAzureCreditApplied": {
+                "currency": "USD",
+                "value": 0.00
+              },
+              "subTotal": {
+                "currency": "USD",
+                "value": 33.99
+              },
+              "taxAmount": {
+                "currency": "USD",
+                "value": 0.00
+              },
+              "totalAmount": {
+                "currency": "USD",
+                "value": 7.53
               },
               "invoicePeriodStartDate": "2018-01-01T17:32:28Z",
               "invoicePeriodEndDate": "2018-01-15T17:32:28Z",
+              "isMonthlyInvoice": false,
               "billingProfileId": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/{billingProfileName}",
               "billingProfileDisplayName": "Contoso Operations Billing",
               "purchaseOrderNumber": "123456",
@@ -52,7 +77,7 @@
                   "paymentType": "credited",
                   "amount": {
                     "currency": "USD",
-                    "value": 2000.00
+                    "value": 1.00
                   },
                   "paymentMethodFamily": "CreditCard",
                   "paymentMethodType": "visa"
@@ -70,14 +95,39 @@
               "status": "Due",
               "amountDue": {
                 "currency": "USD",
-                "value": 2000.00
+                "value": 16.53
               },
               "billedAmount": {
                 "currency": "USD",
-                "value": 2000.00
+                "value": 33.99
+              },
+              "azurePrepaymentApplied": {
+                "currency": "USD",
+                "value": 15.46
+              },
+              "creditAmount": {
+                "currency": "USD",
+                "value": 2.00
+              },
+              "freeAzureCreditApplied": {
+                "currency": "USD",
+                "value": 0.00
+              },
+              "subTotal": {
+                "currency": "USD",
+                "value": 33.99
+              },
+              "taxAmount": {
+                "currency": "USD",
+                "value": 0.00
+              },
+              "totalAmount": {
+                "currency": "USD",
+                "value": 16.53
               },
               "invoicePeriodStartDate": "2018-02-01T17:32:28Z",
-              "invoicePeriodEndDate": "2018-02-30T17:32:28Z",
+              "invoicePeriodEndDate": "2018-02-28T17:32:28Z",
+              "isMonthlyInvoice": true,
               "billingProfileId": "/providers/Microsoft.Billing/billingAccounts/{billingAccountName}/billingProfiles/{billingProfileName}",
               "billingProfileDisplayName": "Contoso Operations Billing",
               "purchaseOrderNumber": "123456",
@@ -101,7 +151,7 @@
                   "paymentType": "credited",
                   "amount": {
                     "currency": "USD",
-                    "value": 2000.00
+                    "value": 2.00
                   },
                   "paymentMethodFamily": "CreditCard",
                   "paymentMethodType": "visa"