Importing javascript functions to GWT using JSInteropr?

Is it possible to import the API of a javascript library to GWT using JsInterop?

E.g, stripe.js has methods such as: Stripe.card.validateCardNumber(number) which takes a string, and takes a boolean.

I have a feeling that it should be possible to import this function using @JsMethod perhaps, but I'm not sure of the exact syntax. The specs doc is a little bit lacking in examples.

I'm using 2.8.0-beta1 

Question 2: What if a javascript API performs some async function, and requires a callback to be passed in which contains the result of the operation. Is that possible to handle using JsInterop?

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