eSignature API Integration Guides & Resources
Discover the ultimate guide to eSignature API integration. Learn about eSignature benefits, core functionalities, key features, and best practices for implementation.
Unified E-Sign API
Unified E-Sign API
One Unified E-Signature API to integrate with DocuSign, Adobe Sign, and all your customers’ favorite E-Sign tools.
What is a Unified E-Sign API?
E-Sign platforms each store data differently, with their own authentication and schemas. A Unified E-Sign API standardizes these into one interface — operations like Send Document, Get Sign URL, Download work the same way no matter which platform is on the other end, while Knit manages translation, rate limiting, retries, and sync management underneath.
E-Sign API Operations
Every operation below is real and already live — not a roadmap item. Browse the full API reference →
Send Document
Send documents for signature to one or more recipients
Get Sign URL
Generate a signing URL to embed or share with recipients
Download
Download signed document files for archival or processing
After Sign
Trigger actions automatically after a document is signed
Send Reminder
Send reminders to recipients to complete document signing
Missing an operation?
Our AI Agent builds it instantly.
Try Now5 E-Sign apps you can integrate with today
Adobe Sign
Build Adobe Sign API integration via Knit's Unified E-Sign API — one schema, one integration.
Digio
Add Digio API integration via Knit's Unified E-Sign API — no per-platform maintenance.
DocuSign
DocuSign integrates via Knit's Unified E-Sign API — one schema, one integration.
E-Mudhra
Offer E-Mudhra API integration via Knit's Unified E-Sign API — live in days, not weeks.
Leegality
Leegality integrates via Knit's Unified E-Sign API — no per-platform maintenance.
Don't see your app here?
Describe it to our AI Integrations Agent and get a working integration instantly — no waiting on our roadmap.
Meet the Integrations AgentWhy Knit for E-Sign integrations
Extensive webhook support
Real-time sync without constant polling — get notified the moment E-Sign data changes.
Scalable infra
Sync thousands of E-Sign records in minutes, not hours.
Add a missing app in days
AI-powered connector building means a missing E-Sign platform isn't a months-long wait.
Unified E-Sign API vs. building it yourself
Building it yourself
- A separate integration for every E-Sign platform you support
- Different schema, auth, and pagination per platform
- You build and maintain OAuth for each platform
- Poll each API on your own schedule
- Engineering effort grows with every new platform
- Weeks to months per platform, per engineer
With Knit
- One Unified E-Sign API covers every platform you support
- One normalized schema across every platform
- Embedded Auth handles OAuth, storage, and refresh for you
- Extensive webhook support for real-time sync
- Describe a missing app to the Integrations Agent and get it built instantly
- Live in days, not months
Customer Stories
See how leading technology firms are scaling their operations
Amazing Product With Exceptional Support from the team. By using Knit we managed to speed up our development by orders of magnitude.
H
Huynh H
Developer, Multiplier
A brilliant tool to let you seamlessly integrate with many different systems. It is very easy to integrate with and customer support is next level.
J
Jayesh
Co-Founder, Scrut
Seamless integration experience. Well-documented, self-explanatory APIs, and excellent service and support.
P
Poorvi
Product Manager, Onsurity
Easy to integrate. Knit's dashboard is intuitive for setting up and testing integrations, and the sandbox is extremely useful during development.
A
Aditya
Product Lead, RazorpayXPayroll
Knit shipped a brand-new Timesheet API in a week and handed us a ready-to-use NetSuite sandbox. That velocity is priceless when you're running payroll in 40+ countries.
R
Rohit Singh
GM, Payoneer Workforce Management
#1 in Ease of Integrations
4.9 out of 5 stars on G2
FAQ
Common questions about the Unified E-Sign API
Which E-Sign systems does Knit support?
5 E-Sign platforms today — including Adobe Sign, Digio, DocuSign and more. Missing one you need? Knit's AI-assisted connector-build process typically adds a new one within days.
Does the Unified E-Sign API support both reading and writing data?
Yes. It supports both reads and writes, so you can build bi-directional sync use cases — not just pull E-Sign data, but push updates back to the source app.
How does authentication work across E-Sign platforms?
Knit provides an embedded Auth component (white-labeling available on higher tiers) that handles OAuth, credential storage, and refresh — your customers authorize once through Knit, and you never touch raw credentials.
What is the timeline for adding a missing E-Sign connector?
Typically days, not months — the same AI-based connector-build tooling that lets us maintain the 5 E-Sign connectors already live.
Do you store E-Sign data or customer PII?
No. Knit acts as a stateless passthrough — data is processed on our application server and sent directly to your webhooks, without being stored on Knit's servers.
What is the pricing model, and is there a free trial?
You choose the model that fits your business — pricing based on integrated accounts, or based on API call volume. Every plan includes a 30-day free trial before billing starts.
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