How to Integrate Electronic Signature into Your Business Processes

In an environment where efficiency and traceability are essential, automating the signing of documents has become a priority for companies undergoing digital transformation.

With the eEvidence electronic signature API, you can integrate simple and advanced signatures directly into your internal systems, eliminating manual steps and maintaining full control over the user experience.

What is an electronic signature API?

An API (Application Programming Interface) is a set of functions that allows different systems to communicate with each other.
In the case of electronic signatures, the API acts as a bridge between your business application (CRM, ERP, intranet, etc.) and the digital signing service.

This allows your users or employees to:

• Send documents for signature directly from the software they already use.
• Sign electronically without leaving your corporate environment.
• Automatically receive legally binding evidence of the signature process.

With the eEvidSign API, your company can offer advanced signatures and full traceability without building a signature infrastructure of its own.

Benefits of integrating signature through an API

1. Complete automation of the document workflow
   Documents are generated, sent, and signed without manual intervention — ideal for customer contracts, HR documents, or internal agreements.

2. Better user experience
   The signature can take place within the same environment (for example, a customer portal or internal app), without redirecting the user to an external platform.

3. Scalability
   The API can handle thousands of signatures simultaneously, adapting to business volume and activity peaks.

4. Operational savings
   Fewer steps, fewer errors, and a significant reduction in administrative costs and validation times.

How integration works with eEvidSign API

The eEvidSign REST API enables the implementation of advanced electronic signature workflows in any environment or programming language.

A typical flow looks like this:

1. Document creation
   Your system generates the contract, consent, or form in PDF format.

2. Signature request
   The API sends the document to the signer via registered email or secure link.

3. Identification and signing
   The user accesses the document, identifies themselves (for example, through an OTP code), and signs electronically.

4. Evidence retrieval
   The API returns a package containing the signed document and access to the audit trail.

5. Archiving or synchronization
   The document and its evidences are automatically stored in your system, CRM, or ERP.

Practical example of integration

A professional services firm wants its clients to sign proposals and contracts directly from its extranet.

Using the eEvidSign API:

• The system generates the contract PDF and calls the API to create the signature request.
• The client receives a registered email with the signing link.
• After verifying their identity, they sign with one click from their mobile or browser.
• The API automatically notifies the firm’s system once the document is signed and returns the signed PDF and technical evidence.

The entire process takes place in seconds, without manual intervention.

Security and legal compliance

Every signature integration using the eEvidSign API complies with:

• Regulation (EU) 910/2014 (eIDAS) on electronic identification and trust services.
• TLS encryption in all communications.
• Full traceability of every action (sending, opening, signing, validation).

The result: legally binding, verifiable documents at any time.

Most common use cases

• Automated client and supplier contracts.
• Signing of quotes or purchase orders.
• HR documentation (employment contracts, annexes, onboarding).
• Electronic consents or authorizations.
• Digital onboarding or internal approval processes.

Companies across all sectors — from professional services to banking and public administration — are integrating electronic signature via API to accelerate processes and reduce costs.

Frequently Asked Questions (FAQ)

What do I need to use the signature API?

Just an eEvidence account and API credentials. The documentation is available in the developer portal.

Can it be integrated with my CRM or ERP?

Yes. The API is compatible with any environment that supports HTTP or REST calls.

Is the signature legally valid across the EU?

Yes. It fully complies with the eIDAS Regulation and is legally valid in all EU countries.

Can I automate multiple document signatures?

Yes. The API supports bulk and multi-signer workflows, including status management and automatic notifications.

Conclusion

Integrating electronic signature via API is a key step toward document automation and digital efficiency. It enables you to sign contracts, consents, or notifications automatically, securely, and with full legal validity directly from your own systems.

With the eEvidSign API by eEvidence, your company can digitize complex workflows without compromising traceability, security, or compliance.