curl -X POST https://api.dropboxapi.com/2/users/get_current_account \
    --header "Authorization: Bearer <ACCESS_TOKEN>"

<ACCESS_TOKEN> should be replaced with your access token.

#include <stdio.h>
#include <curl/curl.h>


int main (int argc, char *argv[])
{
      CURL *curl;
      CURLcode res;

      /* In windows, this will init the winsock stuff */ 
      curl_global_init(CURL_GLOBAL_ALL);
     
      /* get a curl handle */ 
      curl = curl_easy_init();
      if(curl) {

            printf ("Running curl test.\n");

            struct curl_slist *headers=NULL; /* init to NULL is important */
            headers = curl_slist_append(headers, "Authorization: Bearer <ACCESS_TOKEN>");
            headers = curl_slist_append(headers, "Content-Type: application/json");
            curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
             
            curl_easy_setopt(curl, CURLOPT_URL, "https://api.dropbox.com/2/users/get_current_account");
            curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "null");

            /* Perform the request, res will get the return code */ 
            res = curl_easy_perform(curl);

            /* Check for errors */ 
            if(res != CURLE_OK)
                  fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));

            /* always cleanup */
              curl_easy_cleanup(curl);

              printf ("\nFinished curl test.\n");

      }
      curl_global_cleanup();

      printf ("Done!\n");
      return 0;

}

<ACCESS_TOKEN> should be replaced with your access token.

This uses the Dropbox Python SDK to get the user's account information from the Dropbox API.

import dropbox
dbx = dropbox.Dropbox("<ACCESS_TOKEN>")
dbx.users_get_current_account()  

<ACCESS_TOKEN> should be replaced with the access token.

<?php

$headers = array("Authorization: Bearer <ACCESS_TOKEN>",
                 "Content-Type: application/json");

$ch = curl_init('https://api.dropboxapi.com/2/users/get_space_usage');
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, "null");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);

curl_close($ch);
echo $response;

?>

<ACCESS_TOKEN> should be replaced with the OAuth 2 access token.

$url = "https://api.dropboxapi.com/2/users/get_current_account"

$req = [System.Net.HttpWebRequest]::Create($url)
$req.headers["Authorization"] = "Bearer <ACCESS_TOKEN>"
$req.Method = "POST"

$res = $req.GetResponse()
Write-Host "Response Status Code: "$res.StatusCode
Write-Host "Response Status Description: "$res.StatusDescription
$readStream = new-object System.IO.StreamReader $res.GetResponseStream()
$result = $readStream.ReadToEnd() | ConvertFrom-Json
Write-Host $result
$readStream.Close()
$res.Close()

<ACCESS_TOKEN> should be replaced with your access token.

jQuery.ajax({
    url: 'https://api.dropboxapi.com/2/users/get_current_account',
    type: 'POST',
    headers: {
        "Authorization": "Bearer <ACCESS_TOKEN>"
    },
    success: function (data) {
        console.log(data);
    },
    error: function (error) {
        console.log(error);
    }
})

<ACCESS_TOKEN> should be replaced with the OAuth 2 access token.

This uses the Dropbox Objective-C SDK to get the user's account information from the Dropbox API.

[[client.usersRoutes getCurrentAccount] response:^(DBUSERSFullAccount *account, DBNilObject *_, DBRequestError *error) {
    if (account) {
        NSLog(@"%@", account);
    } else if (error) {
        NSLog(@"%@", error);
    }
}];