--- title: "Step 4: Exchange code for token (NO AUTH + PKCE)" description: You can use the /{{envID}}/as/token endpoint to obtain an access token by presenting its authorization grant. In this activity, the token request identifies authorization_code as the grant type, and it must also provide the code value returned in the resume endpoint. component: pingone-api page_id: pingone-api:workflow-library:platform-sso-and-authorization/openid-connect-oidc/client-authentication-methods/test-the-workflow/none/step-6-get-the-token canonical_url: https://developer.pingidentity.com/pingone-api/workflow-library/platform-sso-and-authorization/openid-connect-oidc/client-authentication-methods/test-the-workflow/none/step-6-get-the-token.html section_ids: usage-summary: Usage summary headers: Headers body: Body example-request: Example Request example-response: Example Response --- # Step 4: Exchange code for token (NO AUTH + PKCE) ## ```none POST {{authPath}}/{{envID}}/as/token ``` You can use the `/{{envID}}/as/token` endpoint to obtain an access token by presenting its authorization grant. In this activity, the token request identifies `authorization_code` as the grant type, and it must also provide the `code` value returned in the resume endpoint. With the `pkceEnforcment` property enabled on the application, the token request must provide the `code_verifier` parameter value. This parameter is used to verify the `code_challenge` value submitted in the authorization request. The token request transforms the `code_verifier` property value using the `code_challenge_method` specified in the authorize request. If the transformed `code_verifier` value is equal to the `code_challenge` value submitted in the authorize request, then the authorization server issues the token. ### Usage summary This workflow demonstrates authentication for public clients (SPAs, mobile apps) that cannot securely store secrets. Here are the key factors: **Token request** * No Client Secret: Public clients don't have secrets * Request body: * `grant_type` is `authorization_code` * `code` (authorization code) * `redirect_uri` * `client_id` is `{{publicClientAppID}}` (only `client_id`, no secret) * `code_verifier` is the `{{pkceCodeVerifier}}` **PKCE flow** * Authorization: Send `code_challenge` (SHA256 hash of verifier) * Token: Send `code_verifier` (original random string) * Server verifies: `SHA256(code_verifier)` equals the `code_challenge` value * Prevents code interception attacks **Security model** * No shared secrets to steal. * PKCE protects against authorization code interception. * Code verifier proves possession of original challenge. * Safe for JavaScript apps, mobile apps. **When to use** * Single Page Applications (React, Angular, Vue) * Mobile apps (iOS, Android) * Desktop apps without secure storage * Any client that cannot keep secrets confidential | | | | - | ------------------------------------------------------------------------------------------------------------------------------- | | | **Important:** Public clients are limited to certain grant types and should use short-lived tokens with refresh token rotation. | ### Headers Content-Type      application/x-www-form-urlencoded ### Body urlencoded ( application/x-www-form-urlencoded ) | Key | Value | | -------------- | -------------------------------- | | grant\_type | authorization\_code | | code | {{publicAuthCode}} | | redirect\_uri | | | client\_id | {{nativeAppID}} | | code\_verifier | {{pkceCodeVerifier}} | ## ### Example Request * cURL * C# * Go * HTTP * Java * jQuery * NodeJS * Python * PHP * Ruby * Swift ```shell curl --location --globoff '{{authPath}}/{{envID}}/as/token' \ --header 'Content-Type: application/x-www-form-urlencoded' \ --data-urlencode 'grant_type=authorization_code' \ --data-urlencode 'code={{publicAuthCode}}' \ --data-urlencode 'redirect_uri=http://localhost:3000/callback' \ --data-urlencode 'client_id={{nativeAppID}}' \ --data-urlencode 'code_verifier={{pkceCodeVerifier}}' ``` ```csharp var options = new RestClientOptions("{{authPath}}/{{envID}}/as/token") { MaxTimeout = -1, }; var client = new RestClient(options); var request = new RestRequest("", Method.Post); request.AddHeader("Content-Type", "application/x-www-form-urlencoded"); request.AddParameter("grant_type", "authorization_code"); request.AddParameter("code", "{{publicAuthCode}}"); request.AddParameter("redirect_uri", "http://localhost:3000/callback"); request.AddParameter("client_id", "{{nativeAppID}}"); request.AddParameter("code_verifier", "{{pkceCodeVerifier}}"); RestResponse response = await client.ExecuteAsync(request); Console.WriteLine(response.Content); ``` ```golang package main import ( "fmt" "strings" "net/http" "io" ) func main() { url := "{{authPath}}/{{envID}}/as/token" method := "POST" payload := strings.NewReader("grant_type=authorization_code&code=%7B%7BpublicAuthCode%7D%7D&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fcallback&client_id=%7B%7BnativeAppID%7D%7D&code_verifier=%7B%7BpkceCodeVerifier%7D%7D") client := &http.Client { } req, err := http.NewRequest(method, url, payload) if err != nil { fmt.Println(err) return } req.Header.Add("Content-Type", "application/x-www-form-urlencoded") res, err := client.Do(req) if err != nil { fmt.Println(err) return } defer res.Body.Close() body, err := io.ReadAll(res.Body) if err != nil { fmt.Println(err) return } fmt.Println(string(body)) } ``` ```http POST /{{envID}}/as/token HTTP/1.1 Host: {{authPath}} Content-Type: application/x-www-form-urlencoded grant_type=authorization_code&code=%7B%7BpublicAuthCode%7D%7D&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fcallback&client_id=%7B%7BnativeAppID%7D%7D&code_verifier=%7B%7BpkceCodeVerifier%7D%7D ``` ```java OkHttpClient client = new OkHttpClient().newBuilder() .build(); MediaType mediaType = MediaType.parse("application/x-www-form-urlencoded"); RequestBody body = RequestBody.create(mediaType, "grant_type=authorization_code&code={{publicAuthCode}}&redirect_uri=http://localhost:3000/callback&client_id={{nativeAppID}}&code_verifier={{pkceCodeVerifier}}"); Request request = new Request.Builder() .url("{{authPath}}/{{envID}}/as/token") .method("POST", body) .addHeader("Content-Type", "application/x-www-form-urlencoded") .build(); Response response = client.newCall(request).execute(); ``` ```javascript var settings = { "url": "{{authPath}}/{{envID}}/as/token", "method": "POST", "timeout": 0, "headers": { "Content-Type": "application/x-www-form-urlencoded" }, "data": { "grant_type": "authorization_code", "code": "{{publicAuthCode}}", "redirect_uri": "http://localhost:3000/callback", "client_id": "{{nativeAppID}}", "code_verifier": "{{pkceCodeVerifier}}" } }; $.ajax(settings).done(function (response) { console.log(response); }); ``` ```javascript var request = require('request'); var options = { 'method': 'POST', 'url': '{{authPath}}/{{envID}}/as/token', 'headers': { 'Content-Type': 'application/x-www-form-urlencoded' }, form: { 'grant_type': 'authorization_code', 'code': '{{publicAuthCode}}', 'redirect_uri': 'http://localhost:3000/callback', 'client_id': '{{nativeAppID}}', 'code_verifier': '{{pkceCodeVerifier}}' } }; request(options, function (error, response) { if (error) throw new Error(error); console.log(response.body); }); ``` ```python import requests url = "{{authPath}}/{{envID}}/as/token" payload = 'grant_type=authorization_code&code=%7B%7BpublicAuthCode%7D%7D&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fcallback&client_id=%7B%7BnativeAppID%7D%7D&code_verifier=%7B%7BpkceCodeVerifier%7D%7D' headers = { 'Content-Type': 'application/x-www-form-urlencoded' } response = requests.request("POST", url, headers=headers, data=payload) print(response.text) ``` ```php setUrl('{{authPath}}/{{envID}}/as/token'); $request->setMethod(HTTP_Request2::METHOD_POST); $request->setConfig(array( 'follow_redirects' => TRUE )); $request->setHeader(array( 'Content-Type' => 'application/x-www-form-urlencoded' )); $request->addPostParameter(array( 'grant_type' => 'authorization_code', 'code' => '{{publicAuthCode}}', 'redirect_uri' => 'http://localhost:3000/callback', 'client_id' => '{{nativeAppID}}', 'code_verifier' => '{{pkceCodeVerifier}}' )); try { $response = $request->send(); if ($response->getStatus() == 200) { echo $response->getBody(); } else { echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' . $response->getReasonPhrase(); } } catch(HTTP_Request2_Exception $e) { echo 'Error: ' . $e->getMessage(); } ``` ```ruby require "uri" require "net/http" url = URI("{{authPath}}/{{envID}}/as/token") http = Net::HTTP.new(url.host, url.port); request = Net::HTTP::Post.new(url) request["Content-Type"] = "application/x-www-form-urlencoded" request.body = "grant_type=authorization_code&code=%7B%7BpublicAuthCode%7D%7D&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fcallback&client_id=%7B%7BnativeAppID%7D%7D&code_verifier=%7B%7BpkceCodeVerifier%7D%7D" response = http.request(request) puts response.read_body ``` ```swift let parameters = "grant_type=authorization_code&code=%7B%7BpublicAuthCode%7D%7D&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fcallback&client_id=%7B%7BnativeAppID%7D%7D&code_verifier=%7B%7BpkceCodeVerifier%7D%7D" let postData = parameters.data(using: .utf8) var request = URLRequest(url: URL(string: "{{authPath}}/{{envID}}/as/token")!,timeoutInterval: Double.infinity) request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type") request.httpMethod = "POST" request.httpBody = postData let task = URLSession.shared.dataTask(with: request) { data, response, error in guard let data = data else { print(String(describing: error)) return } print(String(data: data, encoding: .utf8)!) } task.resume() ``` ### Example Response 200 OK ```json { "access_token": "eyJraWQiOiI2YzkyNjVjMC1iNWJ", "token_type": "Bearer", "expires_in": 3600, "scope": "openid", "id_token": "eyJraWQiOiI2YzkyNjVjMC1iNWJm" } ```