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An API key from the dashboard under Settings → API keys, sent as Authorization: Bearer aem_….

Authorization has two independent axes.

The scope is ranked — a key satisfies any requirement at or below its own tier:

• read — see messages, contacts and metrics. Changes nothing, and cannot send.
• write — everything read does, plus managing templates, contacts, automations, segments and suppressions. This is what editing a template needs.
• admin — everything write does, plus sending configuration: domains, senders, webhook registration, kill switch, daily cap, brand.

There is no approve scope. It was a rung once; it is not one now, and a key requested with it is rejected.

The approval grant (can_approve) is a separate boolean, not a rung. Delivering mail to a real inbox needs write and the grant. Keeping them on separate axes is what makes the review gate a control rather than a convention: a key that may propose is not automatically a key that may approve its own proposal.

Give your application the lowest tier that works. Most need write and the grant — the dashboard mints that combination as Send + manage; Manage only is the same rung with the grant withheld.

Scope: write