Create a new billing account for your user that you can then collect payment from our push events to.
If you leave off any Stripe information on the account, Fermata will create a Stripe customer ID for them.
You can pass a credit card token to add a payment method to that account.
If you already created a Stripe customer for them, then pass in the ID and we will attach to it.
We can generate a page to collect credit card information and bill them for the given plan
if you specify the enable_card_collector option