List unmatched usage
Events whose customer or product identifier matched no record, grouped by the value your application sent. Requires scope: usage:read.
Use it when a customer’s usage reads 0: their events may be arriving under an id no record carries. Later events with that key match once a record carries it in the module’s identifier property.
Authorizations
A Custral secret API key (sk_…), created in Settings → Applications. Sent as Authorization: Bearer sk_…. The X-Api-Key: sk_… header is also accepted and takes precedence. Never expose a secret key in a browser.