eIDAS Electronic Signature API: Automate Your Signing Processes
Electronic signatures are becoming a central component of your business workflows. Integrating the e-Signature.eu API means eliminating manual friction, ensuring eIDAS compliance and keeping your clients within your own digital environment — no subscription, no infrastructure to deploy.
For a CTO or IT manager, the question is no longer whether electronic signatures are useful — they are — but how to integrate them seamlessly into existing systems. CRM, ERP, client portal, onboarding platform: every break in the user journey between your tools and a third-party signing service represents a risk of abandonment, an additional delay and a degraded experience for your users.
An electronic signature API solves this problem at the source. It allows you to trigger, track and retrieve signatures directly from your applications, without ever forcing the user to leave your environment.
✅ What API integration changes in practice
- Automatic triggering of signature requests from your existing workflows
- Real-time tracking of each signature status via webhooks
- Automatic retrieval of the signed document
- Centralised visibility over all signatures in the e-Signature.eu dashboard
- Choice of signature level (QES, AES, SES) suited to each regulatory context
A multi-method API, eIDAS compliant
The e-Signature.eu API exposes all the signature methods available on the platform, each corresponding to a level defined by the eIDAS regulation. A single endpoint is enough to cover all your use cases, from low-sensitivity internal documents to high-value legal contracts.
| Method | eIDAS level | Coverage | Cost / signature |
|---|---|---|---|
| itsme® | QES — Qualified | 32 European countries | 1 credit |
| Evrotrust | QES — Qualified | 62 countries | 1 credit |
| Veriff | AES — Advanced | 198 countries | 0.7 credit |
| OTP Email | SES — Simple | Worldwide | 0.4 credit |
📌 Regulatory reminder
Only a qualified electronic signature (QES) is legally equivalent to a handwritten signature under the eIDAS regulation. It is notably required by certain administrations such as the INPI in France. The API allows you to dynamically select the appropriate level according to the document type or regulatory requirement.
Two integration modes for your architecture
The API offers two distinct operating modes, suited to different levels of integration and user journey requirements.
📧 Invitations managed by e-Signature.eu
You send the document and the signatories’ details. The platform handles email invitations, automatic reminders and tracking.
- Quick and lightweight integration
- Emails and reminders included
- Ideal for asynchronous workflows
💡 Concrete example
A financial institution integrates the API in embedded mode: as soon as a client finalises their account opening request, the QES signing URL is generated server-side and displayed directly in the interface. The client signs in seconds, without leaving the portal. The signed document is automatically archived via webhook.
Integration in 2 steps
The e-Signature.eu API follows a standard RESTful architecture, accompanied by comprehensive documentation and a ready-to-use Postman collection.
Step 1 — Authentication & submission
Secure API key, then transmission of the PDF with the signatories’ details, the chosen signature method and the operating mode (email or server URL).
Step 2 — Signing & retrieval
Email sent or URL returned to your server. The signature status and signed document (Base64) are automatically delivered by webhook as soon as the signature is completed.
Typical business use cases
🏦 Banking, insurance & fintech
Client onboarding, SEPA mandates, credit agreements: the API lets you integrate qualified signing with identity verification (Evrotrust or Veriff) directly into the client journey, with no break between KYC and signature.
🏢 CRM & contract management
Connect the API to your CRM (Salesforce, HubSpot, Odoo…) to automatically trigger a QES signature request as soon as a quote is approved. Sales teams no longer need to manually manage sending or tracking contracts.
🏗️ Real estate & property management
Leases, inventory reports, mandates and sale agreements: the API allows you to collect signatures from multiple parties with fine-grained control over signing order and full traceability at every step.
🌍 Internationally active businesses
With Evrotrust (62 countries) and Veriff (198 countries), a single API integration covers all your markets. No need to juggle multiple providers depending on the geography.
An economic model built for professional volumes
The e-Signature.eu API is based on a pay-as-you-go model with no subscription and no volume commitment. A degressive pricing structure applies: the more you use, the lower the cost per signature.
For IT teams, this model eliminates the risk tied to annual commitments and allows for progressive scaling — you pay for exactly what you use.
💡 Good to know
1 credit = 1 signature, regardless of the number of documents in the request. No monthly fees, no volume commitment.
Resources to get started
The e-Signature.eu API runs directly in production. To access it, order your first credits at e-signature.eu/tarifs: this step creates your account and gives you access to your API key and user ID from the dashboard.
📌 Prerequisites before you start
Order your credits at our-prepaid-credit-packages to create your account and obtain your API key. Pricing is degressive: the higher your volume, the lower the cost per signature.
- Postman collection: all endpoints pre-configured, importable and executable in one click.
- Interactive documentation: complete reference for parameters, responses, error codes and scenarios.
- Callback URL: your server URL for receiving webhooks can be provided directly in each API request, or sent later by email to support if not yet available at the time of integration.
Conclusion
Integrating the e-Signature.eu API means transforming electronic signing from a manual step into a native component of your business applications — eIDAS compliant, covered across 198 countries, with no subscription and full visibility over every transaction from your dashboard.
Whether you operate in banking, insurance, real estate or contract management, the API gives you the tools to automate your signing processes at scale, while keeping your clients within your own environment.
Integrate eIDAS signing into your applications
Order your credits to create your account, access your API key and start your integration.