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Home/ Questions/Q 7674557
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T16:45:51+00:00 2026-05-31T16:45:51+00:00

I am using the OAuth 2.0 PHP Library to develop a OAuth 2.0 server

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I am using the OAuth 2.0 PHP Library to develop a OAuth 2.0 server in PHP.

In the example of that library I can see 3 tables: auth_codes, clients and tokens.

As far as I know tokens are used to access the data and auth codes are used to obtain tokens.

But the problem is that if i do

...authorize.php?client_id=0123456789ab&response_type=token&state=test_state

I can get token without even getting the access code.

How is that possible ? Is this a proper implementation ?

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  1. Editorial Team
    Editorial Team
    2026-05-31T16:45:53+00:00Added an answer on May 31, 2026 at 4:45 pm

    There are two flows for OAuth2 authentcation.

    1. Two-legged OAuth
    2. Three-legged OAuth

    Here you have encountered 2-legged OAuth which doesn’t require the auth_code to get access_token dance 🙂

    These are some useful links that will help you understand the difference better.

    1. http://cakebaker.42dh.com/2011/01/10/2-legged-vs-3-legged-oauth/
    2. https://sites.google.com/site/oauthgoog/2leggedoauth/2opensocialrestapi
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