Stripe: add initialize option

Pull: stripe/stripe-node#703
Doc: https://github.com/stripe/stripe-node#initialize-with-config-object

types/stripe/index.d.ts

@@ -83,7 +83,7 @@ declare class Stripe {
     resources: typeof Stripe.resources;
     StripeResource: typeof Stripe.StripeResource;
 
-    constructor(apiKey: string, version?: string);
+    constructor(apiKey: string, config?: Stripe.Config);
 
     accounts: Stripe.resources.Accounts;
     balance: Stripe.resources.Balance;
@@ -173,6 +173,17 @@ declare namespace Stripe {
     /** Any Stripe source, including a bank account, credit/debit card, or less common "Source" types (see https://stripe.com/docs/api/sources/object). */
     type IStripeSource = cards.ICard | bitcoinReceivers.IBitcoinReceiver | bankAccounts.IBankAccount | sources.ISource;
 
+    // The config object for the constructor.
+    interface Config {
+        apiVersion?: string | null;
+        maxNetworkRetries?: number;
+        httpAgent?: Agent | null;
+        timeout?: number;
+        host?: string;
+        port?: number;
+        telemetry?: boolean;
+    }
+
     namespace accounts {
         // Helper
         type IExternalAccount = bankAccounts.IBankAccount | cards.ICard;

types/stripe/stripe-tests.ts

@@ -1,11 +1,20 @@
 import Stripe = require('stripe');
 import { customers } from 'stripe';
-
-const stripe = new Stripe('sk_test_BF573NobVn98OiIsPAv7A04K');
-
 import { Agent as HttpAgent } from 'http';
 import { Agent as HttpsAgent } from 'https';
 
+new Stripe('sk_test_BF573NobVn98OiIsPAv7A04K', {
+  apiVersion: '2019-08-08',
+  maxNetworkRetries: 1,
+  httpAgent: new HttpAgent(),
+  timeout: 1000,
+  host: 'api.example.com',
+  port: 123,
+  telemetry: true,
+});
+
+const stripe = new Stripe('sk_test_BF573NobVn98OiIsPAv7A04K');
+
 stripe.setHttpAgent(new HttpAgent());
 stripe.setHttpAgent(new HttpsAgent());