Electronic Signature
Developers
Features
API for eSignature Solutions
Set up SMS authentication using the API | airSlate SignNow API

Customize an SMS
authentication message via the API

Ensure only verified users can access your embedded signing sessions. Enable two-factor authentication via SMS and customize the message you use to share a password with your recipient.

Free to test
Fast to deploy
Powerful & secure

Set up SMS authentication using the API

The airSlate SignNow API makes it easy to enhance the security of your documents by preventing unauthorized users from gaining access. When configuring your embedded eSignature invite, simply add an authentication parameter to the request body and specify the authentication method – SMS, create a password, and personalize your SMS message.

cURL

Node.js

C#

Java

Python

.NET

Copy code

curl --request POST \
      --url https://api-eval.signnow.com/v2/documents/document_id/embedded-invites \
      --header 'Accept: application/json, ' \
      --header 'Authorization: Bearer {{access_token}}' \
      --header 'Content-Type: application/json' \
      --data '{
          "name_formula": "document_name|signer1_name|date",
          "invites": [
            {
                "email": "signer_1_@emaildomain.com",
                "role_id": "role_id_1",
                "order": 1,
                "auth_method": "none",
                "first_name": "first_name",
                "last_name": "last_name",
                "prefill_signature_name": "Jane Doe",
                "force_new_signature": 1,
                "redirect_uri": "Your redirect URI",
                "authentication": {
                    "type": "phone",
                    "method": "sms",
                    "phone": "+1XXXXXXXXX",
                    "sms_message": "Custom test message with {password}"
                }
             }
       }

airSlate SignNow provides developers with complete SDKs for every popular language, allowing them to integrate eSignatures without writing a single line of code.
With airSlate SignNow’s detailed documentation, integrating electronic signatures with your app is a breeze.
airSlate SignNow goes beyond eSignatures. Use it to create fillable forms, request payments, and manage your documents securely using simple API calls.

View full API reference

Choose a signer authentication method that fits into your workflow

SMS verification

Send an SMS with a personalized message and unique password. Signers will be required to enter the password you shared with them via SMS to access the signing session inside your application.

Phone call verification

Provide a relevant phone number and your signer will receive a phone call prior to gaining access to an embedded signing session. The signer passes authentication once they pick up the phone call.

Password protection

Create a secret password for accessing an embedded signing session and share it discreetly with your signers. They will have to enter the password to complete the verification and access your document.

Enhance the security of your integrated signing experiences with two-factor authentication

Improved security & compliance

Confirm the identity of users before they can sign documents within your application. Reduce the risk of fraudulent activities and ensure your app complies with the highest data security regulations.

Personalized user experience

Customize the two-factor authentication process with personalized messages using the airSlate SignNow API. This not only adds an extra layer of security but also enhances the user experience by making the process more engaging and intuitive.

Easy and quick implementation

All you need to set up dual-factor authentication via the API is to add a few lines of code while configuring your embedded eSignature invite.

airSlate SignNow regularly wins awards for ease of use and setup

Read our reviews on the trusted resources

Tech Data uses airSlate SignNow to improve our internal and external customer service while increasing our speed to revenue.

Bob Dutkowsky | CEO

Select an API package for your business

Integrate eSignatures into your software and get 250 legally-binding signature invites with your API free trial.

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Solution engineers

We are here to help you configure eSignature API to your workflow.

Review airSlate SignNow’s API documentation

The detailed API tutorial will guide you through the entire integration process and provide clear coding examples.

Video guides

Watch our video guides for instructions on how to easily build custom integrations.

Start with any of our SDKs

Get complete SDKs for Node.js, Python,
PHP, Java, C#.

Enterprise-grade security and compliance

airSlate SignNow is committed to protecting your sensitive information by complying with global industry-specific security standards.

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GDPR compliance

Regulates the use and holding of personal data belonging to EU residents.

SOC 2 Type II Certified

Guarantees the security of your data & the privacy of your clients.

PCI DSS certification

Safeguards credit/debit card data for every monetary transaction a customer makes.

21 CFR Part 11

FDA-backed standards for electronic documentation and electronic signatures.

HIPAA compliance

Protects the private health information of your patients.

CCPA compliance

Enhances the protection of personal data and the privacy of California residents.

Watch the airSlate SignNow API in action

Start building your eSignature integration with a quick video guide

Watch the video tutorial to kick-start your project.

Trusted eSignature solution — what our customers are saying

Explore how the airSlate SignNow eSignature platform helps businesses succeed. Hear from real users and what they like most about electronic signing.

Everything has been great, really easy to incorporate...

5

Liam R

Everything has been great, really easy to incorporate into my business. And the clients who have used your software so far have said it is very easy to complete the necessary signatures.

Read full review

I couldn't conduct my business without contracts and...

5

Dani P

I couldn't conduct my business without contracts and this makes the hassle of downloading, printing, scanning, and reuploading docs virtually seamless. I don't have to worry about whether or not my clients have printers or scanners and I don't have to pay the ridiculous drop box fees. Sign now is amazing!!

Read full review

airSlate SignNow

5

Jennifer

My overall experience with this software has been a tremendous help with important documents and even simple task so that I don't have leave the house and waste time and gas to have to go sign the documents in person. I think it is a great software and very convenient.

airSlate SignNow has been a awesome software for electric signatures. This has been a useful tool and has been great and definitely helps time management for important documents. I've used this software for important documents for my college courses for billing documents and even to sign for credit cards or other simple task such as documents for my daughters schooling.

Read full review