API & Developer Hub

Integrate eSign’s API eSignature software for a smoother digital experience for you and your customers. Get in with us today to request sandbox access.

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API Developer Portal for eSign

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Maximise eSign’s Digital Signatures

eSign's API enables you to elevate and customise your applications, providing bespoke solutions to meet your business demands. With robust security and a user-friendly Developer Hub, you can effortlessly integrate electronic signatures, optimise document workflows, and deploy multi-factor authentication, all entirely tailored to your specific operational goals.
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4.6 / 5

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1.1 million
documents processed per month
20,000
new signers per month
400,000
envelopes sent per month
1.1 million
documents processed per month
20,000
new signers per month
400,000
envelopes sent per month

Synchronise your workflow with API.

Simplify Document Creation and Management with E-Sign

Streamline your digital document processes, automate agreements, and enhance efficiency by integrating our secure API into your software.

Designed to meet your unique business needs, our API is the perfect tool for fostering growth and maximising productivity.

  • Effortless Integration: Embed E-Sign into your current systems with ease for a seamless user experience.
  • Top-Notch Security: Safeguard your data with cutting-edge security protocols.
  • Developer-Centric Features: Leverage advanced tools and updates to stay in control of your Developer account.
Synchronise Workflows with API

User friendly and accessible.

Unlock the Potential of the E-Sign Developer Hub

The E-Sign Developer Hub offers comprehensive guides and practical code examples, making it easier to integrate and address common scenarios effortlessly.

With advanced features and a built-in testing playground, you have the power and flexibility to customise your integration to perfection.

  • Effortless Workflow Design: Create tailored workflows to meet your specific requirements seamlessly.
  • Detailed API Documentation: Explore interactive and user-friendly resources for a hassle-free integration process.
  • Quick API Token Management: Generate and manage secure API tokens with ease.
  • Advanced Insights Dashboard: Gain access to in-depth analytics and account-wide data insights.
  • Flexible and Scalable Customisation: Adapt your integration to meet your evolving business needs.
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Cost Savings with eSignatures

Secure and compliant API software.

Simplify Workflow Management with API

eSign offers users full assurance that the API service they choose through us is secure to the highest standards and compliant with relevant laws and regulations.

Our platform features full end-to-end encryption that protects the contents of each document and the user’s sensitive data. Workflows can become disorganised and inefficient when you’re working with multiple different systems, but an API can solve that problem. It makes document management more effective and allows your team to organise their time more efficiently, which increases productivity.

Benefits of API Software

API Documentation.

Developer Hub for eSign Customers

eSign’s developer hub helps make integrating and using the API software as straightforward as possible. 

Through the hub you will be able to access links to essential documentation and reference code, in addition to the latest tools and SDK’s.

API Reference
eSign API Developer Hub

Integrate with Leading Tools

Create bespoke workflows to suit your business with a range of application integrations.

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Testimonials

multivac-esign-customer

Mid Devon District Council

“Using eSign has made our tenancy completion processes so simple. You don’t have to be technically savvy to be able to use the platform and it doesn’t draw on any other ICT resources. Our tenancy agreements and documents are signed within minutes and we’ve even had tenants’ comment on how easy it is to use as a signer which is fantastic.”

Lisa Harber | Team Leader 
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University of Oxford

“The University of Oxford have appointed eSign UK Ltd. as their preferred electronic signature platform. eSign quickly guided departments on the most cost-effective and efficient route offered, providing continued support to ensure contracts were completed and deadlines met.”

Purchasing Department | End User
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Paratus Law

“The law supports the use of electronic signatures, and eSign is an essential tool for any business wishing to enhance customer experience and accelerate revenue. Esign is incredibly user-friendly, and using it has been a very positive experience both for me and for my clients.”

Simon Arthur | Owner
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Beyondly

“eSign has transformed our operations at Beyondly. Integrating eSign into our systems was relatively straight forward and has massively improved customer and team experience. As a Bcorp organisation we place high value on our environmental impact and since inception, eSign has represented a 31.46kg saving of CO2 entering the atmosphere.”

Emily Rice | Operations Manager
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National Clinical Homecare Association

“The tools are very easy to set up and intuitive to use. When we encountered issues, the eSign team was agile enough to respond, usually on the same day. The copy template feature has made setup with new customers much easier.”

National Clinical Homecare Provider | End User
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Slater Heelis Solicitors

“eSign is an invaluable tool that assists us in keeping track of our legal matters. It gives us full control of the document journey and has greatly improved signature capture and document turnaround times.”

Slater Heelis Solicitors | End User
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Morgan Ash

“Working in the regulated financial and medical markets we need a quick secure and economical signature process. eSign gives us all of these.”

Andrew Gething | Managing Director
Leicester Hospital Case Study

University Hospitals of Leicester

“We have seen significant improvements in our pharmacy service efficiency since implementing E-Sign. The platform is user-friendly and has allowed our team to securely and reliably provide prescriptions for crucial patient medication, minimising the risk of supply disruption and saving valuable time. Collaborating with E-Sign has been an easy process, Desi and Luke have always been professional and approachable to offer support when needed.”

Amy Page | Kidney Pharmacy Team
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Blue I Properties

“Can’t recommend esign enough. It is quicker, easier and cheaper to use than many of their competitors.  The detailed Document History provides useful evidence and proof of when your document was created and signed.  Their team members are extremely knowledgeable of the systems, friendly and professional.  All in all, an amazing product at a very competitive price.”

Debbie Collins | Lettings Administrator
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Government Property Agency

“One thing which sets eSign apart is their flexible signature packages, allowing flexibility in both pricing and usage to provide the best solution for the organisation. The GPA has been very well looked after by our eSign account manager and we look forward to continuing our relationship with them.”

Government Property Agency | End User
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10-100

“The solution was simple to use, has a great management portal, and the price met our expectations. We now use the product for our own internal use and have recommended and deployed it into our customers when we get requests for signature solutions. eSign’s ongoing support is excellent, and they are continuously improving and developing their solution.”

Paul Visagie | IT Consultant
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Cambridgeshire County Council

“eSign has brought both time and efficiency benefits to our department since we started using the platform two years ago. It is easy to use and they have useful training videos available which have been helpful for training our team on how to use the platform and its features.”

Wendy Ballard | End User
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Churchill Support Services

“Using eSign has significantly reduced the time it takes to send and receive contracts which means we close deals quicker. I especially like how you can redirect and edit documents without creating new envelopes and keep track of which contracts are pending signature as an admin. As an environmentally friendly business, it’s helpful to see how much carbon we are saving with the carbon counter. I would definitely recommend eSign to a business who is looking to close deals faster.”

Katie Butcher | Client Relationship Manager
university-of-salford-testimonial

University of Salford

“We use eSign at the University of Salford to issue copyright declaration forms when supplying copies of material to users of our archives. We used to issue the forms as attachments to emails, but users found it difficult to sign and return the forms, especially if they didn’t have a printer. Sending the forms using eSign has made it much easier and quicker for our users to sign and return the forms. From our end it is simple and straightforward to issue the forms via eSign and we get a notification when they have been completed.”

End User | University of Salford
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Polden Bower

“We are a group of three schools operating across six sites supported by a Central Team, so we’re looking for an electronic approval solution that would bring about significant efficiency, both in time and cost. We wanted a user-friendly system that would comply with finance policy, manifest maximum engagement from all Signatories, and had the capability to offer more as we grow as an organisation.  eSign fits the bill on all fronts for us from affordability, cost savings, accessibility and functionality perspectives, right through to tried and trusted customer service, support and data security.  We spent our first year on the Business Plan to embed this new way of working into our processes and we are now ready to roll out eSign access to other Central departments as we upgrade to the Enterprise subscription.  The user guides, chat facility, training offer and support provided by eSign is all really helpful and the team are always responsive when we get in touch.  It’s also reassuring that the Data Centres are in the UK and are managed by eSign.”  

Alison Sanders | Executive Finance Officer
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Boon Brokers

“E-Sign has significantly helped our operations at Boon Brokers. Previously, clients had to manually print, sign, and scan documentation back to us. With the help of E-Sign’s API, we have managed to integrate the system into our software. This now enables all clients to easily E-Sign our fact-finds within a matter of clicks via e-mail. This has significantly improved the efficiency of our business. Thank you, E-Sign.”

Gerard Boon | Managing Director, Boon Brokers
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Thula

“We are very proud and thrilled to be working with the eSign team, creating a truly digital and revolutionising management tool for controlled drugs in a post-pandemic world. The benefits to the clinical and pharmacy teams are huge and drives greater legislative and regulatory confidence and safer and efficient patient care.”

Adele McAllister | Manager
Hessington Health Testimonial

Hessington Health

“Hessington Health is a busy national health screening and occupational health practice with over 18 independent schools and over 10,000 staff members. The challenge we have faced is reminding employees to sign consent forms before we release the reports to their employers. This is an incredibly time consuming process. E-Sign has offered us the perfect solution. The online dashboard allows us to track the consent forms in their journey, Set reminders and have a safe place to store the completed forms. This has saved us an immense amount of time and improved our governance in this area. It also allows the user to create bespoke forms meaning any organisation from any sector will be able to utilise this package.”

Harjeev Rai | Medical Director

Business Benefits of API

Increased Efficiency
Increased Automation

API’s enable you to incorporate more automation into your workflow for a more streamlined and productive document process.

User Friendly Platform
One Simplified Software

With an API you can seamlessly integrate as many applications as needed into one, simple software, making it easier to organise.

Service Level Agreement
Better Customer Experience

Integrating applications allows you to give your customers a more user-friendly and smooth experience using your website.

Elimate Human Error
Flexible and Convenient Functionality

An integrated API can be effective at removing barriers between your business and your customers, and encourage more visitors through greater functionality.

Increased Security
Highly Secure Software

Through eSign you can have complete assurance that your data and communications are handled in a secure and compliant manner.

Reduce Filing
Build on Existing Systems

eSign’s API gives you the flexibility to form an integrated process based on your current or new applications to update your existing operations.

Featured Industries

Discover eSignature solutions and use cases in your industry.

Accountancy & Tax

Simplify accountancy and tax workflows with digital tools, including e-signatures for tax documents, bookkeeping, with seamless software integrations.

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esignatures accountancy industry

Education

eSign supports educational organisations with digital tools for enrolment, HR, financial aid, and other documentation needs.

Learn More
esignatures education industry

Finance

Streamline financial agreements, speed up transactions, and eliminate manual tasks using secure electronic signatures and digital workflows.

Learn More
esignatures in the finance industry

Healthcare

eSign delivers comprehensive digital document solutions tailored for healthcare organisations, enhancing efficiency, accelerating processes, and cutting costs.

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esignatures in healthcare industry

Legal

Improve compliance, speed up contract management, and simplify document processes with a powerful digital document management solution.

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esignatures in legal industry

Discover More Industries

eSign powers digital transformation across various industries, providing tailored solutions for organisations and individuals.

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discover esignatures in all industries

Feature Examples

API Developer eSign
Signature workflow via Iframe

Create envelopes from within your existing system using eSign’s iframe functionality. 

LEARN MORE
Send an API
One Click Send And Sign

Use the API to create and sign an envelope in just one click.

LEARN MORE
Use Authority Checker
Use OAuth 2 To Get Data

Retrieve account data with eSign’s OAuth functionality. 

LEARN MORE

Interested in testing our API? Request sandbox access today

The API is available to trial for 14 days. Sign up today using your email address below and request an API token, or contact us for more information.
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CHOOSE YOUR TEMPLATE TO SUIT YOUR BUSINESS NEEDS

Templates

eSign templates simplify document signing for your business, saving time and resources. Easily integrate electronic signatures into your workflow, whether it’s contracts, agreements, or other legal documents.

View eSign Templates

eSign Case Studies

NCHA Case Study
National Clinical Homecare Association

The healthcare industry clearly recognised the need to adopt a digital approach to prescription processing, giving operational advantages, regulatory compliance and improvements to patient safety.

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Mid Devon Case Study
Mid Devon District Council

There has been significant time and cost savings on the sign-up process for new tenants as there is no longer a requirement for officers or tenants to travel to meet in a location to sign the agreement. 

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Leicester Hospitals eSign Case Study
University Hospitals Leicester

We have seen significant improvements in our pharmacy service efficiency since implementing E-Sign. The platform is user-friendly and has allowed our team to securely and reliably provide prescriptions for crucial patient medication.

LEARN MORE

Frequently Asked Questions

An Application Programming Interface (API) acts as a software intermediary that allows various applications to communicate with each other. With an API, you can effortlessly and securely connect your business processes, services, content, and data with channel partners, internal teams, and independent developers.

An API provides customers with a range of well-integrated features that enhance both flexibility and convenience, making it particularly valuable when integrating digital signatures with other applications.

The E-Sign API enables developers to effortlessly integrate E-Sign’s electronic signature functionalities into their own applications. Through this API, developers can efficiently create, send, and manage documents requiring electronic signatures. It also offers features for tracking document signing progress and managing account settings and user profiles.

The E-Sign API offers an effective solution for streamlining the management of signed agreements. Developers can seamlessly integrate their systems with the API, which provides a dependable and user-friendly method to upload documents, initiate signing requests, send reminders, and gather electronic signatures.

Here are the key terms and their definitions commonly used in our API:

Document

A document is a file uploaded to E-Sign that is part of an envelope. Once uploaded, it can be utilised to create templates, included in envelopes, or attached as an additional file.

Envelope

An envelope is a container for all the essential information needed for an e-signature transaction. It comprises one or more documents, signers, and metadata like the envelope’s author and transaction details. Each envelope is assigned a unique ID for reference and interaction.

Signer

Signers are the primary recipients of envelopes. They are designated when creating the envelope and are required to review, approve, and sign the included documents. Each envelope must have at least one signer.

Template

Templates are predefined models that facilitate the rapid sending of envelopes with standardised information. Frequently used documents or signer groups can be set up in templates for efficiency.

Webhook

Webhooks are automated messages sent from one application to another when a specific event occurs. These notifications, or payloads, are sent to a designated URL and are generally quicker and more efficient than polling methods.

OAuth

OAuth provides a secure way to access user data without requiring the user to share their E-Sign password. This widely adopted authorisation framework allows users to permit an application to interact with another service on their behalf using access tokens, thereby keeping their credentials private.

To use our API, you will require an API key, separate keys may be required to access the sandbox environment. API keys do not expire unless you revoke them. Requests are authenticated using the ‘Authorisation: Token API_KEY’ header.

Example:

curl -X GET “https://sandbox.e-sign.co.uk/v3/accounts” -H “accept: application/json” -H “Authorisation: Token API_KEY”

E-Sign uses standard HTTP response codes to convey the result of an API request. Typically:

  • 2xx Codes indicate that the request was successful.
  • 4xx Codes signal errors related to the provided information, such as missing parameters or failed charges.
  • 5xx Codes represent server errors on E-Sign’s end, though these are infrequent.
Code Explanation
200 – OK Everything worked as expected.
201 – Created The request succeeded, and a new resource was created as a result.
204 – No Content The server has successfully fulfilled the request and that there is no additional content to send in the response payload body.
400 – Bad Access The request was unacceptable, often due to missing a required parameter.
401 – Unauthorised No valid API key provided.
402 – Request Failed The parameters were valid but the request failed.
403 – Forbidden The API key doesn’t have permissions to perform the request.
404 – Not Found The server can not find the requested resource – the endpoint is valid but the resource itself does not exist.
409 – Conflict The request conflicts with another request (perhaps due to using the same idempotent key).
410 – Gone This response is sent when the requested content has been permanently deleted from the server, with no forwarding address.
422 – Unprocessable Entity The request was well-formed but was unable to be followed due to semantic errors.
429 – Too Many Requests Too many requests hit the API too quickly. We recommend an exponential backoff of your requests.
500, 502, 503, 504 – Server Errors Something went wrong on E-sign’s end. These responses are very uncommon.

Our API lets you customise and extend the functionality of your apps to meet your unique business needs. Create efficiencies with our API, guided by our comprehensive developer documentation guides and code samples.

To access our API, the first step is to request an API token. Once you have the access token, you can test access to our API through our API Reference. The API Reference makes interacting with our API easy and intuitive.

Learn more about our API and set up your sandbox account through our guide.

To upload a document through E-Sign’s API you will need:

  • The document title – E.g New Contract
  • BASE64 encoded document
  • Extension – Options: pdf, doc, docx, rtf, txt, ppt, png, jpg
  • File type – Options: document, attachment, logo, email_signature, avatar, seal

You will need to make a POST request to the endpoint https://${ENV}.e-sign.co.uk/v3/uploads, providing the parameters mentioned above.

Visit the full guide for uploading a document.

To create an envelope in its simplest form, certain minimum parameters must be included in the body of the request. These include providing a title for your envelope, specifying the title and ID of the document to be added, and the name and email of the signer.

It is important to note that you need to upload the document to our system before adding it to the envelope. See the ‘How to Upload a File’ guide in our Developer Hub if you’re unsure how to do this. 

Visit the full guide to see how to generate your envelope.

To sign a document within an envelope, you will need the following information: the ID of the signer (signer_id) and the ID of the document (document_id) that is to be signed.

 

To sign a document, make a POST request to the following endpoint, including the signer_id and document_id:

POST https://${ENV}.e-sign.co.uk/v3/signers/${SIGNER_ID}/documents/${DOCUMENT_ID}

Replace ${SIGNER_ID} and ${DOCUMENT_ID} with the appropriate IDs of the signer and document, respectively.

Visit the full guide to learn how to sign a document.

The “Adding Fields to a Document Using an Iframe” feature allows you to embed an iframe within your application, giving you access to our web application. This enables you to add fields to your document and send your envelope without developing a custom interface.

Visit the full guide to learn more about adding fields to your document.

Did you know that you can track and receive updates on the status of an envelope once it has been created, completed, signed, or declined? By setting up webhooks, you can monitor these events in real time.

Our webhooks guide will take you through the process of creating, viewing, and deleting webhooks using E-Sign’s API.

The “One Click Send and Sign” feature allows users to view a document, enter their information, click a single button to sign, and complete the process—all in just one click.

Visit our full Click to Sign guide in the Developer Hub.

OAuth2 is a robust and flexible authorisation framework that allows users to grant third-party applications limited access to their resources on the E-Sign platform without exposing their credentials.

By using the authorisation code grant flow, OAuth2 enables secure, delegated access where users can authorise an application to act on their behalf, ensuring that the application only accesses what is necessary and within the permissions granted.

Learn everything you need to know about using OAuth, including creating an OAuth app and requesting user authorisation, in our guide.

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