Authorization header on every request:
Keys
Keys are issued from the partner dashboard, not through public signup. Two prefixes tell the environments apart:clmt_live_: live mode, against real companies and billing.clmt_test_: test mode, against a sandbox that creates nothing real.
Errors
A missing, malformed, or revoked key is answered401 with the standard error
envelope (see Errors):
code, never on detail. The wording may change.