Compute an HMAC-SHA256 hex digest over (clientId || clock || payload). Exposed so clients in tests (and non-Node environments) can produce matching tags from the same canonical encoding.
(clientId || clock || payload)
Compute an HMAC-SHA256 hex digest over
(clientId || clock || payload). Exposed so clients in tests (and non-Node environments) can produce matching tags from the same canonical encoding.