// Link SNS
Route::post('/redirect/{provider}', 'UserSocialMediaController@linkMedia');
Route::get('/callback/link/{provider}', 'UserSocialMediaController@saveMedia')->name('socialLinkCallback');

use CanbuildSocialProvider;
/**
 *
 * link SNS
 *
 */
public function linkMedia(Request $request)
{
    $provider = $request->route('provider');
    $this->provider = $provider;
    $redirectUrl = url('/callback/link/' . $provider);

    return $this->buildSocialProvider($redirectUrl)->redirect();
}