Embedded Passwordless Login in Native Applications

To use the Embedded Passwordless APIs in Native applications, make sure you enable the Passwordless OTP grant at Auth0 Dashboard > Applications > Applications in your application's settings under Advanced Settings > Grant Types.

Passwordless authentication for Native applications consists of two steps:

  • Capture the user identifier in your application (the user's email or phone number) and invoke the /passwordless/start endpoint to initiate the passwordless flow. The user will get an email or an SMS with a one-time password.

  • Prompt the user for the one-time-use code, and call the /oauth/token endpoint to get authentication tokens.

Below we list a few code snippets that can be used to call these API endpoints for different scenarios.

Send a one-time-use password via email




  


  
  
curl --request POST \
  --url 'https://{yourDomain}/passwordless/start' \
  --header 'content-type: application/json' \
  --data '{"client_id": "{yourClientId}",  "connection": "email",   "email": "USER_EMAIL",  "send": "code"}'
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/
var client = new RestClient("https://{yourDomain}/passwordless/start");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{\"client_id\": \"{yourClientId}\",  \"connection\": \"email\",   \"email\": \"USER_EMAIL\",  \"send\": \"code\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Was this helpful?
/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/passwordless/start"

	payload := strings.NewReader("{\"client_id\": \"{yourClientId}\",  \"connection\": \"email\",   \"email\": \"USER_EMAIL\",  \"send\": \"code\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
Was this helpful?
/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/passwordless/start")
  .header("content-type", "application/json")
  .body("{\"client_id\": \"{yourClientId}\",  \"connection\": \"email\",   \"email\": \"USER_EMAIL\",  \"send\": \"code\"}")
  .asString();
Was this helpful?
/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/passwordless/start',
  headers: {'content-type': 'application/json'},
  data: {
    client_id: '{yourClientId}',
    connection: 'email',
    email: 'USER_EMAIL',
    send: 'code'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
Was this helpful?
/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"client_id": @"{yourClientId}",
                              @"connection": @"email",
                              @"email": @"USER_EMAIL",
                              @"send": @"code" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/passwordless/start"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                if (error) {
                                                    NSLog(@"%@", error);
                                                } else {
                                                    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                    NSLog(@"%@", httpResponse);
                                                }
                                            }];
[dataTask resume];
Was this helpful?
/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/passwordless/start",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\"client_id\": \"{yourClientId}\",  \"connection\": \"email\",   \"email\": \"USER_EMAIL\",  \"send\": \"code\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
Was this helpful?
/
import http.client

conn = http.client.HTTPSConnection("")

payload = "{\"client_id\": \"{yourClientId}\",  \"connection\": \"email\",   \"email\": \"USER_EMAIL\",  \"send\": \"code\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/passwordless/start", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
Was this helpful?
/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/passwordless/start")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{\"client_id\": \"{yourClientId}\",  \"connection\": \"email\",   \"email\": \"USER_EMAIL\",  \"send\": \"code\"}"

response = http.request(request)
puts response.read_body
Was this helpful?
/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "client_id": "{yourClientId}",
  "connection": "email",
  "email": "USER_EMAIL",
  "send": "code"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/passwordless/start")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
Was this helpful?
/



Send a magic link via email



  


  
  
curl --request POST \
  --url 'https://{yourDomain}/passwordless/start' \
  --header 'content-type: application/json' \
  --data '{ "client_id": "{yourClientId}", "connection": "email", "email": "USER_EMAIL", "send": "link"}'
Was this helpful?
/
var client = new RestClient("https://{yourDomain}/passwordless/start");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{ \"client_id\": \"{yourClientId}\", \"connection\": \"email\", \"email\": \"USER_EMAIL\", \"send\": \"link\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Was this helpful?
/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/passwordless/start"

	payload := strings.NewReader("{ \"client_id\": \"{yourClientId}\", \"connection\": \"email\", \"email\": \"USER_EMAIL\", \"send\": \"link\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
Was this helpful?
/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/passwordless/start")
  .header("content-type", "application/json")
  .body("{ \"client_id\": \"{yourClientId}\", \"connection\": \"email\", \"email\": \"USER_EMAIL\", \"send\": \"link\"}")
  .asString();
Was this helpful?
/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/passwordless/start',
  headers: {'content-type': 'application/json'},
  data: {
    client_id: '{yourClientId}',
    connection: 'email',
    email: 'USER_EMAIL',
    send: 'link'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
Was this helpful?
/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"client_id": @"{yourClientId}",
                              @"connection": @"email",
                              @"email": @"USER_EMAIL",
                              @"send": @"link" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/passwordless/start"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                if (error) {
                                                    NSLog(@"%@", error);
                                                } else {
                                                    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                    NSLog(@"%@", httpResponse);
                                                }
                                            }];
[dataTask resume];
Was this helpful?
/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/passwordless/start",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{ \"client_id\": \"{yourClientId}\", \"connection\": \"email\", \"email\": \"USER_EMAIL\", \"send\": \"link\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
Was this helpful?
/
import http.client

conn = http.client.HTTPSConnection("")

payload = "{ \"client_id\": \"{yourClientId}\", \"connection\": \"email\", \"email\": \"USER_EMAIL\", \"send\": \"link\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/passwordless/start", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
Was this helpful?
/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/passwordless/start")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{ \"client_id\": \"{yourClientId}\", \"connection\": \"email\", \"email\": \"USER_EMAIL\", \"send\": \"link\"}"

response = http.request(request)
puts response.read_body
Was this helpful?
/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "client_id": "{yourClientId}",
  "connection": "email",
  "email": "USER_EMAIL",
  "send": "link"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/passwordless/start")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
Was this helpful?
/



Send a one-time-use password via SMS



  


  
  
curl --request POST \
  --url 'https://{yourDomain}/passwordless/start' \
  --header 'content-type: application/json' \
  --data '{ "client_id": "{yourClientId}",  "connection": "sms",  "phone_number": "USER_PHONE_NUMBER", "send": "code"}'
Was this helpful?
/
var client = new RestClient("https://{yourDomain}/passwordless/start");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{ \"client_id\": \"{yourClientId}\",  \"connection\": \"sms\",  \"phone_number\": \"USER_PHONE_NUMBER\", \"send\": \"code\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Was this helpful?
/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/passwordless/start"

	payload := strings.NewReader("{ \"client_id\": \"{yourClientId}\",  \"connection\": \"sms\",  \"phone_number\": \"USER_PHONE_NUMBER\", \"send\": \"code\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
Was this helpful?
/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/passwordless/start")
  .header("content-type", "application/json")
  .body("{ \"client_id\": \"{yourClientId}\",  \"connection\": \"sms\",  \"phone_number\": \"USER_PHONE_NUMBER\", \"send\": \"code\"}")
  .asString();
Was this helpful?
/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/passwordless/start',
  headers: {'content-type': 'application/json'},
  data: {
    client_id: '{yourClientId}',
    connection: 'sms',
    phone_number: 'USER_PHONE_NUMBER',
    send: 'code'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
Was this helpful?
/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"client_id": @"{yourClientId}",
                              @"connection": @"sms",
                              @"phone_number": @"USER_PHONE_NUMBER",
                              @"send": @"code" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/passwordless/start"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                if (error) {
                                                    NSLog(@"%@", error);
                                                } else {
                                                    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                    NSLog(@"%@", httpResponse);
                                                }
                                            }];
[dataTask resume];
Was this helpful?
/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/passwordless/start",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{ \"client_id\": \"{yourClientId}\",  \"connection\": \"sms\",  \"phone_number\": \"USER_PHONE_NUMBER\", \"send\": \"code\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
Was this helpful?
/
import http.client

conn = http.client.HTTPSConnection("")

payload = "{ \"client_id\": \"{yourClientId}\",  \"connection\": \"sms\",  \"phone_number\": \"USER_PHONE_NUMBER\", \"send\": \"code\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/passwordless/start", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
Was this helpful?
/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/passwordless/start")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{ \"client_id\": \"{yourClientId}\",  \"connection\": \"sms\",  \"phone_number\": \"USER_PHONE_NUMBER\", \"send\": \"code\"}"

response = http.request(request)
puts response.read_body
Was this helpful?
/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "client_id": "{yourClientId}",
  "connection": "sms",
  "phone_number": "USER_PHONE_NUMBER",
  "send": "code"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/passwordless/start")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
Was this helpful?
/



Authenticate an SMS user



  


  
  
curl --request POST \
  --url 'https://{yourDomain}/oauth/token' \
  --header 'content-type: application/json' \
  --data '{ "grant_type": "http://auth0.com/oauth/grant-type/passwordless/otp",  "client_id": "{yourClientId}",  "username": "USER_PHONE_NUMBER",  "otp": "code",  "realm": "sms", "audience": "your-api-audience", "scope": "openid profile email"}'
Was this helpful?
/
var client = new RestClient("https://{yourDomain}/oauth/token");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{ \"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\",  \"client_id\": \"{yourClientId}\",  \"username\": \"USER_PHONE_NUMBER\",  \"otp\": \"code\",  \"realm\": \"sms\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Was this helpful?
/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/oauth/token"

	payload := strings.NewReader("{ \"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\",  \"client_id\": \"{yourClientId}\",  \"username\": \"USER_PHONE_NUMBER\",  \"otp\": \"code\",  \"realm\": \"sms\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
Was this helpful?
/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/oauth/token")
  .header("content-type", "application/json")
  .body("{ \"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\",  \"client_id\": \"{yourClientId}\",  \"username\": \"USER_PHONE_NUMBER\",  \"otp\": \"code\",  \"realm\": \"sms\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}")
  .asString();
Was this helpful?
/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/oauth/token',
  headers: {'content-type': 'application/json'},
  data: {
    grant_type: 'http://auth0.com/oauth/grant-type/passwordless/otp',
    client_id: '{yourClientId}',
    username: 'USER_PHONE_NUMBER',
    otp: 'code',
    realm: 'sms',
    audience: 'your-api-audience',
    scope: 'openid profile email'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
Was this helpful?
/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"grant_type": @"http://auth0.com/oauth/grant-type/passwordless/otp",
                              @"client_id": @"{yourClientId}",
                              @"username": @"USER_PHONE_NUMBER",
                              @"otp": @"code",
                              @"realm": @"sms",
                              @"audience": @"your-api-audience",
                              @"scope": @"openid profile email" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/oauth/token"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                if (error) {
                                                    NSLog(@"%@", error);
                                                } else {
                                                    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                    NSLog(@"%@", httpResponse);
                                                }
                                            }];
[dataTask resume];
Was this helpful?
/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/oauth/token",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{ \"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\",  \"client_id\": \"{yourClientId}\",  \"username\": \"USER_PHONE_NUMBER\",  \"otp\": \"code\",  \"realm\": \"sms\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
Was this helpful?
/
import http.client

conn = http.client.HTTPSConnection("")

payload = "{ \"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\",  \"client_id\": \"{yourClientId}\",  \"username\": \"USER_PHONE_NUMBER\",  \"otp\": \"code\",  \"realm\": \"sms\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/oauth/token", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
Was this helpful?
/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/oauth/token")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{ \"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\",  \"client_id\": \"{yourClientId}\",  \"username\": \"USER_PHONE_NUMBER\",  \"otp\": \"code\",  \"realm\": \"sms\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}"

response = http.request(request)
puts response.read_body
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/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "grant_type": "http://auth0.com/oauth/grant-type/passwordless/otp",
  "client_id": "{yourClientId}",
  "username": "USER_PHONE_NUMBER",
  "otp": "code",
  "realm": "sms",
  "audience": "your-api-audience",
  "scope": "openid profile email"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/oauth/token")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
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/



Authenticate an Email user



  


  
  
curl --request POST \
  --url 'https://{yourDomain}/oauth/token' \
  --header 'content-type: application/json' \
  --data '{"grant_type": "http://auth0.com/oauth/grant-type/passwordless/otp", "client_id": "{yourClientId}", "username": "USER_EMAIL", "otp": "code", "realm": "email", "audience": "your-api-audience", "scope": "openid profile email"}'
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/
var client = new RestClient("https://{yourDomain}/oauth/token");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"username\": \"USER_EMAIL\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
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/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/oauth/token"

	payload := strings.NewReader("{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"username\": \"USER_EMAIL\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
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/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/oauth/token")
  .header("content-type", "application/json")
  .body("{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"username\": \"USER_EMAIL\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}")
  .asString();
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/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/oauth/token',
  headers: {'content-type': 'application/json'},
  data: {
    grant_type: 'http://auth0.com/oauth/grant-type/passwordless/otp',
    client_id: '{yourClientId}',
    username: 'USER_EMAIL',
    otp: 'code',
    realm: 'email',
    audience: 'your-api-audience',
    scope: 'openid profile email'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
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/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"grant_type": @"http://auth0.com/oauth/grant-type/passwordless/otp",
                              @"client_id": @"{yourClientId}",
                              @"username": @"USER_EMAIL",
                              @"otp": @"code",
                              @"realm": @"email",
                              @"audience": @"your-api-audience",
                              @"scope": @"openid profile email" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/oauth/token"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                if (error) {
                                                    NSLog(@"%@", error);
                                                } else {
                                                    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                    NSLog(@"%@", httpResponse);
                                                }
                                            }];
[dataTask resume];
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/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/oauth/token",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"username\": \"USER_EMAIL\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
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/
import http.client

conn = http.client.HTTPSConnection("")

payload = "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"username\": \"USER_EMAIL\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/oauth/token", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
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/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/oauth/token")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"username\": \"USER_EMAIL\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}"

response = http.request(request)
puts response.read_body
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/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "grant_type": "http://auth0.com/oauth/grant-type/passwordless/otp",
  "client_id": "{yourClientId}",
  "username": "USER_EMAIL",
  "otp": "code",
  "realm": "email",
  "audience": "your-api-audience",
  "scope": "openid profile email"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/oauth/token")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
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/



If you prefer, you can use the Android or iOS SDKs, which wrap this APIs in a platform-friendly way:
Customize MFA with Embedded
Customize MFA with embedded flows. Use the MFA API to allow users to enroll and challenge with factors of their choice that are supported by your application.
When your application requests an access token at the oauth/token endpoint, the returned response includes the mfa_token to use the MFA API and the mfa_requirements parameter with a list of authenticators your application currently supports:
{
  "error": "mfa_required",
  "error_description": "Multifactor authentication required",
  "mfa_token": "Fe26...Ha",
  "mfa_requirements": {
    "challenge": [
      { "type": "otp" },
      { "type": "push-notification" },
      { "type": "phone" },
      { "type": "recovery-code" }
    ]
  }
}
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/


Use the mfa_token to call the mfa/authenticator endpoint to list all factors the user has enrolled and match the same type your application supports.  You also need to obtain the matching authenticator_type to issue challenges:
[
  {
    "type": "recovery-code",
    "id": "recovery-code|dev_qpOkGUOxBpw6R16t",
    "authenticator_type": "recovery-code",
    "active": true
  },
  {
    "type": "otp",
    "id": "totp|dev_6NWz8awwC8brh2dN",
    "authenticator_type": "otp",
    "active": true
  }
]
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/


Proceed to enforce the MFA challenge by calling the request/mfa/challenge endpoint.
Further customize your MFA flow with Auth0 Actions. To learn more, read Actions Triggers: post-challenge - API Object.