If anybody is developing their app with angular 4/5 and integrating Stripe.js.
I used NGX-Stripe and have successfully sent the order to Stripe and got the auth token. Then, on success calling Molitin API with the order id to store the users product information.
The link provided above show you how to integrate Stripe service and also create a Stripe element.
If you have any questions. I’ll try to answer them.