The Audit Log tab

Audit Log is the history of a subscription: every change, in order, with who made it.

The events you will see: Created, Activation, Modification, Subscription change, Downgrade and Updated.

Change sets are how a change moves through the system rather than happening all at once: Draft → Created → Pending approval → Approved → Queued → Processing → Applied, or Rejected, Cancelled and Failed.

That chain is the answer to most billing questions. "The customer says we agreed a lower price" is settled by reading when the change was made and by whom. And a change sitting at Pending approval is the usual reason an expected upgrade has not shown up on an invoice — it was entered but never approved.

⟦Failed⟧ is the one to act on. The change was agreed and did not apply, which means the customer is still on the old terms while everyone believes otherwise.

⟦No change set events yet.⟧ on an untouched subscription is normal.

Check the log before changing anything. Seeing that somebody adjusted the same subscription last week usually changes what you were about to do: Change, pause or end a subscription.