In order to configure Stripe Checkout, navigate to Settings -> Plugins -> Payment Processors. Choose Stripe Checkout.
Please ignore in this article any field related to Bitcoin, as Bitcoin is no longer supported by this plugin. You will get something like this:
In order to find your Secret Key and Publishable Key, reference this article.
You can also accept Bitcoins with this plugin. Bitcoin is no longer supported by this plugin.
This is what your customer will be able to see when placing a payment: