     func removeTemporaryUploadFiles () {
         let uploadsPath = POSFileManager.sharedFileManager().uploadsFolderPath()
         POSFileManager.sharedFileManager().removeAllFilesInFolder(uploadsPath)
-    }
-
-    private func validateOAuthToken(scope: String, validationSuccess: () -> Void)  {
-        let oAuthToken = OAuthToken.oAuthTokenWithScope(scope)
-        if oAuthToken?.hasExpired() == false {
-            validationSuccess()
-            return
-        }
-
-        if (oAuthToken?.refreshToken != nil) {
-
-            POSOAuthManager.sharedManager().refreshAccessTokenWithRefreshToken(oAuthToken?.refreshToken, scope: scope, success: {
-
-                validationSuccess()
-
-                }, failure: { (error) -> Void in
-
-                    if error.code == Int(SHCOAuthErrorCode.InvalidRefreshTokenResponse.rawValue) {
-                        self.deleteRefreshTokensAndLogoutUser()
-                    } else {
-                        // TODO: LOG
-                    }
-
-            })
-        } else if (oAuthToken == nil && scope == kOauth2ScopeFull) {
-            // TODO: LOG
-        }
-    }
-
-    private func deleteRefreshTokensAndLogoutUser() {
-        let appDelegate: SHCAppDelegate = UIApplication.sharedApplication().delegate as! SHCAppDelegate
-        if let letterViewController: POSLetterViewController = appDelegate.letterViewController {
-            letterViewController.attachment = nil
-            letterViewController.receipt = nil
-        }
-        APIClient.sharedClient.logout()
-        OAuthToken.removeAllTokens()
-        POSModelManager.sharedManager().deleteAllObjects()
-        NSNotificationCenter.defaultCenter().postNotificationName(kShowLoginViewControllerNotificationName, object: nil)
     }
 
     private func validate(#oAuthToken: OAuthToken?, validationSuccess: (chosenToken: OAuthToken) -> Void)  {

    }

    func validateFullScope(#then: () -> Void) {
        validateOAuthToken(kOauth2ScopeFull) {
            self.updateAuthorizationHeader(kOauth2ScopeFull)
            then()
        }
    }

        return urlString
    }

    func validate(#token: OAuthToken?, thenPerformTask task: NSURLSessionTask) {
        validate(oAuthToken: token) { (chosenToken) -> Void in
            self.updateAuthorizationHeader(oAuthToken: chosenToken)
