Verifying Phones

Verifies phone numbers via SMS OTP using the Sendly Verify API. Sends codes, checks codes, handles expiry, and provides hosted verification sessions. Applies for phone verification, OTP, 2FA, or passwordless login flows.

Phone Verification with Sendly

Quick start

import Sendly from "@sendly/node";

const sendly = new Sendly(process.env.SENDLY_API_KEY!);

const verification = await sendly.verify.send({ to: "[phone]" });
console.log(verification.id); // ver_abc123

const result = await sendly.verify.check(verification.id, { code: "123456" });
console.log(result.status); // "verified" | "failed" | "expired"

REST API

Base URL: https://sendly.live/api/v1

Send OTP

curl -X POST https://sendly.live/api/v1/verify \
  -H "Authorization: Bearer $SENDLY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to": "[phone]", "app_name": "MyApp", "code_length": 6, "timeout_secs": 300}'

Required: to (E.164 format)

Optional: app_name (shown in SMS), code_length (4–10, default 6), timeout_secs (default 300)

Response:

{
  "id": "ver_abc123",
  "status": "pending",
  "phone": "[phone]",
  "expires_at": "2026-04-01T10:05:00Z"
}

In sandbox mode (sk_test_* keys), the response includes sandbox_code with the actual code.

Check code

curl -X POST https://sendly.live/api/v1/verify/ver_abc123/check \
  -H "Authorization: Bearer $SENDLY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"code": "123456"}'

Statuses: verified, failed (wrong code), expired, max_attempts_exceeded (3 attempts max)

Resend OTP

curl -X POST https://sendly.live/api/v1/verify/ver_abc123/resend \
  -H "Authorization: Bearer $SENDLY_API_KEY"

Hosted verification sessions

Zero-code verification UI hosted by Sendly:

curl -X POST https://sendly.live/api/v1/verify/sessions \
  -H "Authorization: Bearer $SENDLY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"success_url": "https://yourapp.com/verified?token={TOKEN}", "brand_name": "MyApp"}'

Returns a url the user visits. After verification, redirects to success_url with a token. Validate the token server-side:

curl -X POST https://sendly.live/api/v1/verify/sessions/validate \
  -H "Authorization: Bearer $SENDLY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"token": "tok_from_redirect"}'

Node.js SDK

import Sendly from "@sendly/node";
const sendly = new Sendly(process.env.SENDLY_API_KEY!);

const v = await sendly.verify.send({ to: "[phone]", appName: "MyApp" });
const check = await sendly.verify.check(v.id, { code: "123456" });
const resend = await sendly.verify.resend(v.id);
const session = await sendly.verify.sessions.create({ successUrl: "https://app.com/done?token={TOKEN}", brandName: "MyApp" });
const validated = await sendly.verify.sessions.validate({ token: "tok_xxx" });

Error handling

Error	Meaning	Action
invalid_phone_number	Not E.164 format	Format as +{country}{number}
verification_expired	Code timed out	Call resend or start new verification
max_attempts_exceeded	3 wrong codes	Start new verification
rate_limit_exceeded	Too many requests	Wait and retry

Sandbox testing

With sk_test_* keys, the sandbox_code field in the send response contains the code. No real SMS is sent. OTP to [phone] always works.

Full reference

• Verify API docs: https://sendly.live/docs/verify
• OTP tutorial: https://sendly.live/docs/tutorials/otp
• Error handling guide: https://sendly.live/docs/how-to/handle-otp-errors