Trello

Register the application at

https://trello.com/app-key

You get one application key per account.

Save the “Key” to “Client id”, the “Secret” to “Secret Key” and “Key” to the “Key” field.

Verify which scope you need at

https://developers.trello.com/page/authorization

Need to change the default scope? Add or update the trello setting to settings.py

SOCIALACCOUNT_PROVIDERS = {
    'trello': {
        'AUTH_PARAMS': {
            'scope': 'read,write',
        },
    },
}