Introduction

ESign is an online e-signature platform: upload a PDF, place fields, invite signers, and receive a digitally sealed document with a tamper-evident audit trail. These docs cover the product and the developer API.

What you can build

• Send documents for signature directly from your own application.
• Track signing progress and react to events with webhooks.
• Download the final sealed PDF and its audit certificate.

Core concepts

• Document — an uploaded PDF with one or more fields placed on it.
• Recipient — a person invited to sign; they sign from an email link, no account required.
• Field — a signature, date, text, or checkbox bound to a recipient and a position on the page.
• Seal — once everyone signs, the document is digitally signed (PAdES) and an audit certificate page is appended.

Next steps

Start with the Quickstart to send your first document, then read Authentication and explore the API reference. Use Webhooks to react to signing events.