title: In the stripe invoice.payment_succeeded webhook, how can I distinguish between a subscription creation and renewal
body: <p>According to the docs, invoice.payment_succeeded is fired both on subscription creation and on renewal.  <a href="https://stripe.com/docs/subscriptions/lifecycle" rel="nofollow noreferrer">https://stripe.com/docs/subscriptions/lifecycle</a></p>
  
  <p>I need different logic for the creation case and the renewal case. What in the data will I be able to use to distinguish between these cases?</p>