
Trello
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Trello provides OAuth1 support for their authentication process.

In order to enable it, follow:

* Generate an Application Key pair at Trello Developers API Keys

* Fill **Consumer Key** and **Consumer Secret** settings:

     SOCIAL_AUTH_TRELLO_KEY = '...'
     SOCIAL_AUTH_TRELLO_SECRET = '...'

There are also two optional settings:

* your app name, otherwise the authorization page will say "Let An
  unknown application use your account?":

     SOCIAL_AUTH_TRELLO_APP_NAME = 'My App'

* the expiration period, social auth defaults to 'never', but you
  can change it:

     SOCIAL_AUTH_TRELLO_EXPIRATION = '30days'
