User enters their number
Your customer types their phone number on your website or app login screen — same flow they already know.
Connect JustAuth to verify your users over WhatsApp. Test the full send-and-verify flow below, then copy the reference into your stack.
Send a test verification code and confirm it — no account required. Responses appear in the console in real time.
JustAuth sits between your application and your users — you keep your login UI, we handle secure code delivery over WhatsApp.
Your customer types their phone number on your website or app login screen — same flow they already know.
Your backend calls JustAuth with the user's number. We validate your wallet, create a secure session, and dispatch the code via WhatsApp.
The user enters the code on your page. Your server asks JustAuth to confirm it — if valid, you sign them in.
All requests use HTTPS with query parameters. Responses are JSON.
/api/v1/send-otp
Generates a secure 6-digit code, stores the session, deducts one verification from your wallet, and delivers the message to the user's WhatsApp.
| Parameter | Type | Required | Description |
|---|---|---|---|
client-id |
string | Yes | Your Client ID (available after your first wallet deposit) |
api-key |
string | Yes | Your API secret key |
number |
string | Yes | Recipient phone in Indian format (e.g. 919876543210) |
{
"success": true,
"message_simulated": "Your verification code is 582931. It will expire in 2 minutes"
}/api/v1/verify-otp
Checks whether the code the user entered is correct and still within the two-minute expiry window.
| Parameter | Type | Required | Description |
|---|---|---|---|
client-id |
string | Yes | Your Client ID |
number |
string | Yes | User's phone number (e.g. 919876543210) |
otp |
string | Yes | The 6-digit code entered by the user |
{
"success": true,
"message": "OTP Verified"
}Drop these templates into your backend to wire up send and verify in minutes.
// 1. Send OTP to user's WhatsApp
async function sendVerification(phoneNumber) {
const url = `https://otp.justauth.in/api/v1/send-otp?client-id=YOUR_CLIENT_ID&api-key=YOUR_API_KEY&number=${phoneNumber}`;
const response = await fetch(url, { method: 'POST' });
const data = await response.json();
if (response.ok) {
console.log('OTP sent successfully!', data);
} else {
console.error('Failed to send OTP:', data.message);
}
}
// 2. Verify code entered by user
async function verifyCode(phoneNumber, code) {
const url = `https://otp.justauth.in/api/v1/verify-otp?client-id=YOUR_CLIENT_ID&number=${phoneNumber}&otp=${code}`;
const response = await fetch(url, { method: 'POST' });
const data = await response.json();
if (response.ok && data.success) {
console.log('User verified successfully!');
} else {
console.error('Verification failed:', data.message);
}
}import requests
# 1. Send OTP to user's WhatsApp
def send_verification(phone_number):
url = f"https://otp.justauth.in/api/v1/send-otp?client-id=YOUR_CLIENT_ID&api-key=YOUR_API_KEY&number={phone_number}"
response = requests.post(url)
data = response.json()
if response.status_code == 200:
print("OTP sent successfully!", data)
else:
print("Failed to send OTP:", data.get("message"))
# 2. Verify code entered by user
def verify_code(phone_number, code):
url = f"https://otp.justauth.in/api/v1/verify-otp?client-id=YOUR_CLIENT_ID&number={phone_number}&otp={code}"
response = requests.post(url)
data = response.json()
if response.status_code == 200 and data.get("success"):
print("User verified successfully!")
else:
print("Verification failed:", data.get("message"))# 1. Send OTP Request
curl -X POST "https://otp.justauth.in/api/v1/send-otp?client-id=YOUR_CLIENT_ID&api-key=YOUR_API_KEY&number=919876543210"
# 2. Verify OTP Request
curl -X POST "https://otp.justauth.in/api/v1/verify-otp?client-id=YOUR_CLIENT_ID&number=919876543210&otp=582931"Ready to go live?
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