Call Your API Using the Authorization Code Flow

This tutorial will help you call your own API using the Authorization Code Flow. If you want to learn how the flow works and why you should use it, see Authorization Code Flow. If you want to learn to add login to your regular web app, see Add Login Using the Authorization Code Flow.

Auth0 makes it easy for your app to implement the Authorization Code Flow using:

Regular Web App Quickstarts: The easiest way to implement the flow.
Authentication API: If you prefer to roll your own, keep reading to learn how to call our API directly.

Before beginning this tutorial:

Register your Application with Auth0.
- Select an Application Type of Regular Web Apps.
- Add an Allowed Callback URL of https://YOUR_APP/callback.
- Make sure your Application's Grant Types include Authorization Code.
- If you want your Application to be able to use Refresh Tokens, make sure the Application's Grant Types include Refresh Token.
Register your API with Auth0
- If you want your API to receive Refresh Tokens to allow it to obtain new tokens when the previous ones expire, enable Allow Offline Access.

Authorize user: Request the user's authorization and redirect back to your app with an authorization code.
Request tokens: Exchange your authorization code for tokens.
Call API: Use the retrieved Access Token to call your API.
Refresh tokens: Use a Refresh Token to request new tokens when the existing ones expire.

Optional: Explore sample use cases

To begin the flow, you'll need to get the user's authorization. This step may include one or more of the following processes:

* Authenticating the user; * Redirecting the user to an Identity Provider to handle authentication; * Checking for active Single Sign-on (SSO) sessions; * Obtaining user consent for the requested permission level, unless consent has been previously given.

To authorize the user, your app must send the user to the authorization URL.

https://YOUR_DOMAIN/authorize?
    response_type=code&
    client_id=YOUR_CLIENT_ID&
    redirect_uri=https://YOUR_APP/callback&
    scope=SCOPE&
    audience=API_AUDIENCE&
    state=STATE

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Note that for authorizing a user when calling a custom API, you:

- must include an audience parameter - can include additional scopes supported by the target API

Parameter Name	Description
`response_type`	Denotes the kind of credential that Auth0 will return (`code` or `token`). For this flow, the value must be `code`.
`client_id`	Your application's Client ID. You can find this value in your Application Settings.
`redirect_uri`	The URL to which Auth0 will redirect the browser after authorization has been granted by the user. The Authorization Code will be available in the `code` URL parameter. You must specify this URL as a valid callback URL in your Application Settings. Warning: Per the OAuth 2.0 Specification, Auth0 removes everything after the hash and does not honor any fragments.
`scope`	Specifies the scopes for which you want to request authorization, which dictate which claims (or user attributes) you want returned. These must be separated by a space. You can request any of the standard OpenID Connect (OIDC) scopes about users, such as `profile` or `email`, custom claims conforming to a namespaced format, or any scopes supported by the target API (e.g., `read:contacts`). Include `offline_access` to get a Refresh Token (make sure that the Allow Offline Access field is enabled in the Application Settings).
`audience`	The unique identifier of the API your web app wants to access. Use the Identifier value on the Settings tab for the API you created as part of the prerequisites for this tutorial.
`state`	(recommended) An opaque arbitrary alphanumeric string your app adds to the initial request that Auth0 includes when redirecting back to your application. To see how to use this value to prevent cross-site request forgery (CSRF) attacks, see Mitigate CSRF Attacks With State Parameters.

As an example, your HTML snippet for your authorization URL when adding login to your app might look like:

<a href="https://YOUR_DOMAIN/authorize?
  response_type=code&
  client_id=YOUR_CLIENT_ID&
  redirect_uri=https://YOUR_APP/callback&  
  scope=appointments%20contacts&
  audience=appointments:api&
  state=xyzABC123">
  Sign In
</a>

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If all goes well, you'll receive an HTTP 302 response. The authorization code is included at the end of the URL:

HTTP/1.1 302 Found
Location: https://YOUR_APP/callback?code=AUTHORIZATION_CODE&state=xyzABC123

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Now that you have an Authorization Code, you must exchange it for tokens. Using the extracted Authorization Code (code) from the previous step, you will need to POST to the token URL.

Example POST to token URL

cURL
C#
Go
Java
Node.JS
Obj-C
...
- PHP
- Python
- Ruby
- Swift

curl --request POST \
  --url 'https://YOUR_DOMAIN/oauth/token' \
  --header 'content-type: application/x-www-form-urlencoded' \
  --data grant_type=authorization_code \
  --data 'client_id=YOUR_CLIENT_ID' \
  --data client_secret=YOUR_CLIENT_SECRET \
  --data code=YOUR_AUTHORIZATION_CODE \
  --data 'redirect_uri=https://YOUR_APP/callback'

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var client = new RestClient("https://YOUR_DOMAIN/oauth/token");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/x-www-form-urlencoded");
request.AddParameter("application/x-www-form-urlencoded", "grant_type=authorization_code&client_id=%24%7Baccount.clientId%7D&client_secret=YOUR_CLIENT_SECRET&code=YOUR_AUTHORIZATION_CODE&redirect_uri=%24%7Baccount.callback%7D", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);

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package main

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

func main() {

	url := "https://YOUR_DOMAIN/oauth/token"

	payload := strings.NewReader("grant_type=authorization_code&client_id=%24%7Baccount.clientId%7D&client_secret=YOUR_CLIENT_SECRET&code=YOUR_AUTHORIZATION_CODE&redirect_uri=%24%7Baccount.callback%7D")

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

	req.Header.Add("content-type", "application/x-www-form-urlencoded")

	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://YOUR_DOMAIN/oauth/token")
  .header("content-type", "application/x-www-form-urlencoded")
  .body("grant_type=authorization_code&client_id=%24%7Baccount.clientId%7D&client_secret=YOUR_CLIENT_SECRET&code=YOUR_AUTHORIZATION_CODE&redirect_uri=%24%7Baccount.callback%7D")
  .asString();

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var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://YOUR_DOMAIN/oauth/token',
  headers: {'content-type': 'application/x-www-form-urlencoded'},
  data: {
    grant_type: 'authorization_code',
    client_id: 'YOUR_CLIENT_ID',
    client_secret: 'YOUR_CLIENT_SECRET',
    code: 'YOUR_AUTHORIZATION_CODE',
    redirect_uri: 'https://YOUR_APP/callback'
  }
};

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/x-www-form-urlencoded" };

NSMutableData *postData = [[NSMutableData alloc] initWithData:[@"grant_type=authorization_code" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&client_id=YOUR_CLIENT_ID" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&client_secret=YOUR_CLIENT_SECRET" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&code=YOUR_AUTHORIZATION_CODE" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&redirect_uri=https://YOUR_APP/callback" dataUsingEncoding:NSUTF8StringEncoding]];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://YOUR_DOMAIN/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://YOUR_DOMAIN/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=authorization_code&client_id=%24%7Baccount.clientId%7D&client_secret=YOUR_CLIENT_SECRET&code=YOUR_AUTHORIZATION_CODE&redirect_uri=%24%7Baccount.callback%7D",
  CURLOPT_HTTPHEADER => [
    "content-type: application/x-www-form-urlencoded"
  ],
]);

$response = curl_exec($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=authorization_code&client_id=%24%7Baccount.clientId%7D&client_secret=YOUR_CLIENT_SECRET&code=YOUR_AUTHORIZATION_CODE&redirect_uri=%24%7Baccount.callback%7D"

headers = { 'content-type': "application/x-www-form-urlencoded" }

conn.request("POST", "/YOUR_DOMAIN/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://YOUR_DOMAIN/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/x-www-form-urlencoded'
request.body = "grant_type=authorization_code&client_id=%24%7Baccount.clientId%7D&client_secret=YOUR_CLIENT_SECRET&code=YOUR_AUTHORIZATION_CODE&redirect_uri=%24%7Baccount.callback%7D"

response = http.request(request)
puts response.read_body

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import Foundation

let headers = ["content-type": "application/x-www-form-urlencoded"]

let postData = NSMutableData(data: "grant_type=authorization_code".data(using: String.Encoding.utf8)!)
postData.append("&client_id=YOUR_CLIENT_ID".data(using: String.Encoding.utf8)!)
postData.append("&client_secret=YOUR_CLIENT_SECRET".data(using: String.Encoding.utf8)!)
postData.append("&code=YOUR_AUTHORIZATION_CODE".data(using: String.Encoding.utf8)!)
postData.append("&redirect_uri=https://YOUR_APP/callback".data(using: String.Encoding.utf8)!)

let request = NSMutableURLRequest(url: NSURL(string: "https://YOUR_DOMAIN/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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Parameter Name	Description
`grant_type`	Set this to `authorization_code`.
`code`	The `authorization_code` retrieved in the previous step of this tutorial.
`client_id`	Your application's Client ID. You can find this value in your Application Settings.
`client_secret`	Your application's Client Secret. You can find this value in your Application Settings.
`redirect_uri`	The valid callback URL set in your Application settings. This must exactly match the `redirect_uri` passed to the authorization URL in the previous step of this tutorial. Note that this must be URL encoded.

If all goes well, you'll receive an HTTP 200 response with a payload containing access_token, refresh_token, id_token, and token_type values:

{
  "access_token": "eyJz93a...k4laUWw",
  "refresh_token": "GEbRxBN...edjnXbL",
  "id_token": "eyJ0XAi...4faeEoQ",
  "token_type": "Bearer"
}

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You should validate your tokens before saving them. To learn how, see Validate ID Tokens and Validate Access Tokens.

ID Tokens contain user information that must be decoded and extracted.

Access Tokens are used to call the Auth0 Authentication API's /userinfo endpoint or another API. If you are calling your own API, the first thing your API will need to do is verify the Access Token.

<dfn data-key="refresh-token">Refresh Tokens</dfn> are used to obtain a new Access Token or ID Token after the previous one has expired. The refresh_token will only be present in the response if you included the offline_access scope and enabled Allow Offline Access for your API in the Dashboard.

Refresh Tokens must be stored securely since they allow a user to remain authenticated essentially forever.

To call your API from a regular web application, the application must pass the retrieved Access Token as a Bearer token in the Authorization header of your HTTP request.

cURL
C#
Go
Java
Node.JS
Obj-C
...
- PHP
- Python
- Ruby
- Swift

curl --request GET \
  --url https://myapi.com/api \
  --header 'authorization: Bearer ACCESS_TOKEN' \
  --header 'content-type: application/json'

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var client = new RestClient("https://myapi.com/api");
var request = new RestRequest(Method.GET);
request.AddHeader("content-type", "application/json");
request.AddHeader("authorization", "Bearer ACCESS_TOKEN");
IRestResponse response = client.Execute(request);

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package main

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

func main() {

	url := "https://myapi.com/api"

	req, _ := http.NewRequest("GET", url, nil)

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

	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.get("https://myapi.com/api")
  .header("content-type", "application/json")
  .header("authorization", "Bearer ACCESS_TOKEN")
  .asString();

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var axios = require("axios").default;

var options = {
  method: 'GET',
  url: 'https://myapi.com/api',
  headers: {'content-type': 'application/json', authorization: 'Bearer ACCESS_TOKEN'}
};

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",
                           @"authorization": @"Bearer ACCESS_TOKEN" };

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://myapi.com/api"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"GET"];
[request setAllHTTPHeaderFields:headers];

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://myapi.com/api",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "authorization: Bearer ACCESS_TOKEN",
    "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("myapi.com")

headers = {
    'content-type': "application/json",
    'authorization': "Bearer ACCESS_TOKEN"
    }

conn.request("GET", "/api", headers=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://myapi.com/api")

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

request = Net::HTTP::Get.new(url)
request["content-type"] = 'application/json'
request["authorization"] = 'Bearer ACCESS_TOKEN'

response = http.request(request)
puts response.read_body

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import Foundation

let headers = [
  "content-type": "application/json",
  "authorization": "Bearer ACCESS_TOKEN"
]

let request = NSMutableURLRequest(url: NSURL(string: "https://myapi.com/api")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

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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You have already received a <dfn data-key="refresh-token">Refresh Token</dfn> if you've been following this tutorial and completed the following:

configured your API to allow offline access
included the offline_access scope when you initiated the authentication request through the authorize endpoint.

You can use the Refresh Token to get a new Access Token. Usually, a user will need a new Access Token only after the previous one expires or when gaining access to a new resource for the first time. It's bad practice to call the endpoint to get a new Access Token every time you call an API, and Auth0 maintains rate limits that will throttle the amount of requests to the endpoint that can be executed using the same token from the same IP.

To refresh your token, make a POST request to the /oauth/token endpoint in the Authentication API, using grant_type=refresh_token.

Example POST to token URL

cURL
C#
Go
Java
Node.JS
Obj-C
...
- PHP
- Python
- Ruby
- Swift

curl --request POST \
  --url 'https://YOUR_DOMAIN/oauth/token' \
  --header 'content-type: application/x-www-form-urlencoded' \
  --data grant_type=refresh_token \
  --data 'client_id=YOUR_CLIENT_ID' \
  --data refresh_token=YOUR_REFRESH_TOKEN

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var client = new RestClient("https://YOUR_DOMAIN/oauth/token");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/x-www-form-urlencoded");
request.AddParameter("application/x-www-form-urlencoded", "grant_type=refresh_token&client_id=%24%7Baccount.clientId%7D&refresh_token=YOUR_REFRESH_TOKEN", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);

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package main

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

func main() {

	url := "https://YOUR_DOMAIN/oauth/token"

	payload := strings.NewReader("grant_type=refresh_token&client_id=%24%7Baccount.clientId%7D&refresh_token=YOUR_REFRESH_TOKEN")

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

	req.Header.Add("content-type", "application/x-www-form-urlencoded")

	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://YOUR_DOMAIN/oauth/token")
  .header("content-type", "application/x-www-form-urlencoded")
  .body("grant_type=refresh_token&client_id=%24%7Baccount.clientId%7D&refresh_token=YOUR_REFRESH_TOKEN")
  .asString();

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var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://YOUR_DOMAIN/oauth/token',
  headers: {'content-type': 'application/x-www-form-urlencoded'},
  data: {
    grant_type: 'refresh_token',
    client_id: 'YOUR_CLIENT_ID',
    refresh_token: 'YOUR_REFRESH_TOKEN'
  }
};

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/x-www-form-urlencoded" };

NSMutableData *postData = [[NSMutableData alloc] initWithData:[@"grant_type=refresh_token" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&client_id=YOUR_CLIENT_ID" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&refresh_token=YOUR_REFRESH_TOKEN" dataUsingEncoding:NSUTF8StringEncoding]];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://YOUR_DOMAIN/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://YOUR_DOMAIN/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=refresh_token&client_id=%24%7Baccount.clientId%7D&refresh_token=YOUR_REFRESH_TOKEN",
  CURLOPT_HTTPHEADER => [
    "content-type: application/x-www-form-urlencoded"
  ],
]);

$response = curl_exec($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=refresh_token&client_id=%24%7Baccount.clientId%7D&refresh_token=YOUR_REFRESH_TOKEN"

headers = { 'content-type': "application/x-www-form-urlencoded" }

conn.request("POST", "/YOUR_DOMAIN/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://YOUR_DOMAIN/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/x-www-form-urlencoded'
request.body = "grant_type=refresh_token&client_id=%24%7Baccount.clientId%7D&refresh_token=YOUR_REFRESH_TOKEN"

response = http.request(request)
puts response.read_body

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import Foundation

let headers = ["content-type": "application/x-www-form-urlencoded"]

let postData = NSMutableData(data: "grant_type=refresh_token".data(using: String.Encoding.utf8)!)
postData.append("&client_id=YOUR_CLIENT_ID".data(using: String.Encoding.utf8)!)
postData.append("&refresh_token=YOUR_REFRESH_TOKEN".data(using: String.Encoding.utf8)!)

let request = NSMutableURLRequest(url: NSURL(string: "https://YOUR_DOMAIN/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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Parameter Name	Description
`grant_type`	Set this to `refresh_token`.
`client_id`	Your application's Client ID. You can find this value in your Application Settings.
`refresh_token`	The Refresh Token to use.
`scope`	(optional) A space-delimited list of requested scope permissions. If not sent, the original scopes will be used; otherwise you can request a reduced set of scopes. Note that this must be URL encoded.

If all goes well, you'll receive an HTTP 200 response with a payload containing a new access_token, its lifetime in seconds (expires_in), granted scope values, and token_type. If the scope of the initial token included openid, then the response will also include a new id_token:

{
  "access_token": "eyJ...MoQ",
  "expires_in": 86400,
  "scope": "openid offline_access",
  "id_token": "eyJ...0NE",
  "token_type": "Bearer"
}

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You should validate your tokens before saving them. To learn how, see Validate ID Tokens and Validate Access Tokens.

You can use Rules to change the returned scopes of Access Tokens and/or add claims to Access and ID Tokens. To do so, add the following rule, which will run after the user authenticates:

function(user, context, callback) {
  // add custom claims to Access Token and ID Token
  context.accessToken['http://foo/bar'] = 'value';
  context.idToken['http://fiz/baz'] = 'some other value';
  // change scope
  context.accessToken.scope = ['array', 'of', 'strings'];
  callback(null, user, context);
}

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Scopes will be available in the token after all rules have run.

Auth0 returns profile information in a structured claim format as defined by the OpenID Connect (OIDC) specification. This means that custom claims added to ID Tokens or Access Tokens must conform to a namespaced format to avoid possible collisions with standard OIDC claims.

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