Dropbox API Getting started with Dropbox API Getting an OAuth 2 access token for the Dropbox API via the code grant using curl

Example

Abbreviated from https://blogs.dropbox.com/developers/2013/07/using-oauth-2-0-with-the-core-api/:

Step 1: Begin authorization

Send the user to this web page, with your values filled in:

https://www.dropbox.com/oauth2/authorize?client_id=<app key>&response_type=code&redirect_uri=<redirect URI>&state=<CSRF token>

The authorization code will be included as the code parameter on the redirect URI.

Step 2: Obtain an access token

curl https://api.dropbox.com/oauth2/token -d code=<authorization code> -d grant_type=authorization_code -d redirect_uri=<redirect URI> -u <app key>:<app secret>

Step 3: Call the API

In your API call, set the header:

Authorization: Bearer <access token>

Check out the blog post for more details, including an important security note on using state to protect against CSRF attacks.