[braintree] Move webhook notifications to their own types (#41922)

* Adds account updater webhook fields

* Create WebhookNotification subclasses

* Use x as T syntax

types/braintree/braintree-tests.ts

@@ -14,9 +14,8 @@ import {
     PaymentMethod,
     PaymentMethodNonce,
     Transaction,
-    SampleNotification,
-    WebhookNotification,
     WebhookNotificationKind,
+    SubscriptionNotification,
 } from 'braintree';
 
 /**
@@ -109,5 +108,6 @@ const gateway: BraintreeGateway = new braintree.BraintreeGateway({
     const notificationResponse = await gateway.webhookNotification.parse(sampleResponse.bt_signature, sampleResponse.bt_payload).catch(console.error);
     if (!notificationResponse) return;
 
-    const notification: WebhookNotification = notificationResponse;
+    const notification: SubscriptionNotification = notificationResponse as SubscriptionNotification;
+    const subscription = notification.subscription;
 })();

types/braintree/index.d.ts

@@ -836,13 +836,34 @@ declare namespace braintree {
         bt_payload: string;
     }
 
-    export class WebhookNotification {
+    export abstract class WebhookNotification {
         kind: WebhookNotificationKind;
         timestamp: Date;
-        subscription?: Subscription;
-        merchantAccount?: MerchantAccount;
-        transaction?: Transaction;
-        dispute?: Dispute;
+    }
+
+    export class TransactionNotification extends WebhookNotification {
+        transaction: Transaction;
+    }
+
+    export class SubMerchantAccountApprovedNotification extends WebhookNotification {
+        merchantAccount: MerchantAccount;
+    }
+
+    export class SubMerchantAccountDeclinedNotification extends WebhookNotification {
+        merchantAccount: MerchantAccount;
+    }
+
+    export class SubscriptionNotification extends WebhookNotification {
+        subscription: Subscription;
+    }
+
+    export class DisputeNotification extends WebhookNotification {
+        dispute: Dispute;
+    }
+
+    export class AccountUpdaterNotification extends WebhookNotification {
+        reportDate: Date;
+        reportUrl: string;
     }
 
     export type WebhookNotificationKind =