create_subscription_with.ex

def create_subscription(email, plan_id, payment_method_id) do
  with %User{customer_id: nil, name: name} = user <-
         Repo.get_by(User, email: email),
       {:ok, %Stripe.Customer{id: customer_id}} <-
         Stripe.Customer.create(%{
           name: name,
           email: email,
           payment_method: payment_method_id,
           invoice_settings: %{
             default_payment_method: payment_method_id
           }
         }),
       {:ok, %Stripe.Subscription{id: subscription_id}} <-
         Stripe.Subscription.create(%{customer: customer_id, items: [%{plan: plan_id}]}),
       {:ok, %User{}} <-
         User.update(user, %{customer_id: customer_id, subscription_id: subscription_id}) do
    {:ok, :subscription_created}
  else
    err ->
      {:error, err}
  end
end