Types needed

[dvanmali]

Describe the solution you'd like

Noticed that the following new types were provided to the UserProvidedConfig but not StripeConfig. Could documentation also be written for the authenticator function:

• authenticator?: RequestAuthenticator;
• stripeContext?: string;

[jar-stripe]

@dvanmali Thanks for the request! I've logged this in our backlog for us to consider.