Send the envelope under review
The human approval action (spec §5.3): same contract as POST /v1/envelopes/{id}/send, scoped to the token’s envelope — validates the stored document, requires ≥1 participant, transitions to in_progress, and emits the atlas/envelope.sent notification event. Requires a send-capable token (read-only links cannot dispatch).
Authorizations
HMAC-signed review token (minted into the envelope's review URL at creation), as a bearer token or a token query param. Capabilities are split per token: a read token grants view + draft editing, a send token grants the dispatch action only — so a forwarded review link can be shared read-only. Scoped to exactly one envelope; never valid as a signer credential.
Body
x >= 1