AFOAuth2Manager *OAuth2Manager =
        [[AFOAuth2Manager alloc] initWithBaseURL:@"https://api.instagram.com/oauth/authorize/"
                                        clientID:kClientID
                                          secret:kClientSecret];

[OAuth2Manager authenticateUsingOAuthWithURLString:<#(NSString *)#> code:<#(NSString *)#> redirectURI:<#(NSString *)#> success:<#^(AFOAuthCredential *credential)success#> failure:<#^(NSError *error)failure#>];
[OAuth2Manager authenticateUsingOAuthWithURLString:<#(NSString *)#> parameters:<#(NSDictionary *)#> success:<#^(AFOAuthCredential *credential)success#> failure:<#^(NSError *error)failure#>];
[OAuth2Manager authenticateUsingOAuthWithURLString:<#(NSString *)#> refreshToken:<#(NSString *)#> success:<#^(AFOAuthCredential *credential)success#> failure:<#^(NSError *error)failure#>];
[OAuth2Manager authenticateUsingOAuthWithURLString:<#(NSString *)#> scope:<#(NSString *)#> success:<#^(AFOAuthCredential *credential)success#> failure:<#^(NSError *error)failure#>];
[OAuth2Manager authenticateUsingOAuthWithURLString:<#(NSString *)#> username:<#(NSString *)#> password:<#(NSString *)#> scope:<#(NSString *)#> success:<#^(AFOAuthCredential *credential)success#> failure:<#^(NSError *error)failure#>];