Platform concepts

A handful of nouns describe the entire platform. Knowing these makes the rest of the documentation easier to navigate.

Concept	Description
Envelope	A specific PDF (or set of PDFs) moving through the signing lifecycle. Has a stable ID and a status.
Signer	A person attached to an envelope with a role: signer, approver, or viewer.
Field	A region on a page where a signer signs, dates, or types information.
Template	A reusable envelope blueprint with pre-placed fields and named signer roles.
Webhook	An HTTPS endpoint you register to receive events as they occur.
Event	An immutable record of something that happened, such as envelope.signed.

Envelopes move through a deterministic lifecycle. See Envelopes for the full set of statuses and transitions.