API key as Bearer token. Use an account key (mfx_acct_...) for
/account/* endpoints, and an environment key (mfx_test_... for
sandbox, mfx_live_... for live) for /environment/*, /faxes,
/webhooks, and /events.
Client-generated key for idempotent submission (recommended). Duplicate keys return the original response without re-processing. Keys expire after 24 hours.
Original fax identifier when this submission is a resend; only present on resends.
Example:
"fax_8aZqRm4yT3vK7pNxJ2bH9c"
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