PERMISSIO
Build e-signature into anything you ship.
The Permissio API is the system of record for sending, signing, and auditing documents. One REST surface, two environments, every event observable through webhooks.
Send an envelope in 5 calls
Upload, attach signers, place fields, send, and stream events. The whole envelope lifecycle is documented end-to-end.
One host, two key prefixes
Sandbox and production share https://app.permissio.us/api. Switch environments by sending an sk_test_… or sk_live_… key.
Webhooks you can trust
Signed payloads, deterministic retries, and an event catalog you can replay against in development.