| Subscription -> Created | subscription.created | A subscription has been created. |
| Subscription -> Updated | subscription.updated | The subscription has been changed, such as status update, trial start & end, cancel at period end, etc. |
| Subscription -> Cancelled | subscription.cancelled | The subscription has been cancelled. |
| Invoice -> Sent | invoice.sent | The invoice is ready to be paid. |
| Invoice -> Paid | invoice.paid | The invoice has been paid successfully. |
| Invoice -> Payment failed | invoice.payment_failed | The invoice is marked as PAYMENT_FAILED and should be treated as bad debt in the accounting process. |
| Invoice -> Payment attempt failed | invoice.payment_attempt_failed | A payment attempt on the invoice failed. |
