Developer Guide

Send SMS Verification

Send an SMS with verification code and a custom message for authentication purpose.

Before sending SMS verification, kindly check whether you have enough SMS credits or not. A 24 hours cooldown required if the SMS failed to deliver 10 times in a day. An API key is needed before using this REST API, thus sign up for an API key if you do not have one.



Parameter Description
tel (required) The recipient mobile phone number in E164 format which is a plus followed by just numbers with no spaces or parentheses.

For example, +12015550123

country_code (optional) ISO 3166 country code for the recipient mobile phone number. If parameter is supplied, then some basic telephone number validation is done.
key (required) FraudLabs Pro API key.
mesg (required) The message template for the SMS. Add <otp> as placeholder for the actual OTP to be generated. Max length is 140 characters.

For example,
Your OTP for the transaction is <otp>

otp_timeout (optional) Timeout feature for OTP value in seconds. Default is 3600 seconds(1 hour). Min timeout is 15 seconds whereas max timeout is 86400 seconds(24 hours).
format (optional) Returns the API response in json (default) or xml format.
Valid values: json | xml

The input parameter must be encoded the same way that the posted data from a WWW form is encoded. In other words, the percent-encoding.


Parameter Description
tran_id Unique ID (20 characters) for this particular API call.
credits_remaining Number of remaining credits for sending SMS.


Test Mobile Phone Number Result
+11 You can enter this bogus phone number to simulate a success SMS sending (No credit will be deducted). For the OTP value, you can enter 123456 to successfully complete the SMS verification.
+11234 Error message of Invalid phone number will be returned.

Sample Codes

require_once 'lib/FraudLabsPro.php';

// Configures FraudLabs Pro API key

// Send SMS Verification
	'tel'			=> '+123456789',
	'mesg'			=> 'Hi, your OTP is <otp>.',
	'country_code'		=> 'US',
import com.fraudlabspro.*;
import java.util.Hashtable;

public class FLP {

    public static void main(String[] args) {
        // Configures FraudLabs Pro API key
        FraudLabsPro.APIKEY = "YOUR_API_KEY";
        // Send SMS Verification API
        SMSVerification sms = new SMSVerification();

        // Sets SMS details for authentication purpose
        Hashtable data = new Hashtable<>();
        data.put("tel", "+123456789");
        data.put("country_code", "US");
        data.put("mesg", "Hi, your OTP is <otp>.");

        String result = sms.sendSMS(data);
Imports FraudLabsPro.FraudLabsPro
Imports Newtonsoft.Json

Module Program
    Sub Main()
        'Configure FraudLabs Pro API KEY
        FraudLabsProConfig.APIKey = "YOUR_API_KEY"

        'Send SMS Verification API
        Dim SendSMS As New SMSVerification

        'Sets SMS details for authentication purpose
        Dim SMSPara As New SMSVerificationPara With {
            .Tel = "+123456789",
            .CountryCode = "US",
            .Message = "Hi, your OTP is <otp>."

        Dim result = SendSMS.SendSMS(SMSPara)

        Console.WriteLine("tran_id: " & result("tran_id").ToString)
        Console.WriteLine("credits_remaining: " & result("credits_remaining").ToString)
    End Sub
End Module
using FraudLabsPro.FraudLabsPro;
using System.Collections;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

// Configure FraudLabs Pro API KEY
FraudLabsProConfig.APIKey = "YOUR_API_KEY";

// Send SMS Verification API
SMSVerification SendSMS = new();

// Sets SMS details for authentication purpose
SMSVerificationPara SMSPara = new()
	Tel = "+123456789",
	CountryCode = "US",
	Message = "Hi, your OTP is <otp>.",
	OtpTimeout = 3600

JObject result = SendSMS.SendSMS(SMSPara);

Console.WriteLine("tran_id: " + result["tran_id"]);
Console.WriteLine("credits_remaining: " + result["credits_remaining"]);

 # Import SDK to use the function
from libs.smsverification import SMSVerification

 # Configure your API key
api_key = 'YOUR_API_KEY'

sms_verification_variables = {
	'key': api_key,
	'tel': '+123456789',
	'country_code': 'US',
	'mesg': 'Your OTP for the transaction is <otp>.',
$ curl -X POST \
	-d "key=Enter_License_Key" \
	-d "format=json" \
	-d "country_code=Enter_Country_Code" \
	-d "tel=Enter_Mobile_Phone_Number" \
	-d "mesg=Hi, your OTP is <otp>"
require 'fraudlabspro_ruby'

FraudlabsproRuby::Configuration.api_key = 'YOUR_API_KEY'

result = FraudlabsproRuby::Api::SMSVerification.sendSMS(
  tel: '+123456789',
  mesg: 'Hi, your OTP is <otp>.',
  country_code: 'US'
const {SMSVerification} = require("fraudlabspro-nodejs");

var sms = new SMSVerification('YOUR API KEY');

params = {
	tel: '+123456789',
	mesg: 'Hi, your OTP is .',
	otp_timeout: 3600,
	country_code: 'US',
sms.sendSMS(params, (err, data) => {
	if (!err) {