Example: App.net

// App.net needs kNXOAuth2AccountStoreConfigurationAdditionalAuthenticationParameters for app store approval,
// therefore we use -setConfiguration:forAccountType:
NSDictionary *appNetConfigDict = @{ kNXOAuth2AccountStoreConfigurationClientID: @"yourClientID",
                                    kNXOAuth2AccountStoreConfigurationSecret: @"yourSecretZZZ",
                                    kNXOAuth2AccountStoreConfigurationScope: [NSSet setWithObjects:@"stream", @"write_post", nil],
                                    kNXOAuth2AccountStoreConfigurationAuthorizeURL: [NSURL URLWithString:@"https://alpha.app.net/oauth/authenticate"],
                                    kNXOAuth2AccountStoreConfigurationTokenURL: [NSURL URLWithString:@"https://alpha.app.net/oauth/access_token"],
                                    kNXOAuth2AccountStoreConfigurationRedirectURL: [NSURL URLWithString:@"yourapp://appnet-callback"],
                                    kNXOAuth2AccountStoreConfigurationTokenType: @"Bearer",
                                    kNXOAuth2AccountStoreConfigurationAdditionalAuthenticationParameters: @{ @"adnview": @"appstore" } };

[[NXOAuth2AccountStore sharedStore] setConfiguration:appNetConfigDict
                                      forAccountType:@"App.net"];