Skip to main content
Live is one of two environment types. Faxes sent in a live environment are delivered to real fax machines and deduct real credits. Sandbox and live use the same API. Three things differ in live: real charges, real recipients, and an activation gate. See Sandbox and live for the full comparison, and Account activation for the gate flow.

​
API keys

Live keys start with mfx_live_. They cannot authenticate against sandbox environments and vice versa. Generate them from the dashboard after the account is activated.

​
Multiple live environments

You can create as many live environments as you need: one per application, per client, per region. They share a single account-level live credit pool, so a top-up against one is available to all of them. Activation is account-level too. Once any first live purchase succeeds, every live environment under the account is immediately usable.
  • Account activation for the gate and the activated_at timestamp
  • Environments for routing and isolation
  • Credits for the account-pool model and hold/capture/release lifecycle
  • Go live for the production-readiness checklist
Last modified on May 13, 2026