Save payment method

[zcesur]

Let's add a button on org settings page to save payment method. In the old app, the flow looks something like this:

• get or create customer linked to org
• create stripe checkout session
  • mode: "setup"
  • billing_address_collection: "required"
  • payment_method_types: ["card"]
  • metadata: %{org_id: org.id}
• redirect to session.url
• listen to checkout.session.completed
• run something like Stripe.PaymentMethod.attach(session.setup_intent.payment_method, customer)
• persist payment_method
• show autopay enabled