can't download anything in app store or iTunes to iPHone or Mac

For the past week, everytime I try to download anything from the App store or iTunes I get a message saying "Unable to Download App" then it says "name of app/song trying to download" could not be downloaded at this time. Done or Retry.

I have logged out of iCloud, iTunes and my AppleiD and nothing has worked. I went online on my Mac and updated my credit card (which was not out of date) and tried to buy a sont on my Mac...purchased, but could not be downloaded. All my devices are having the same problem. In the Error details on my Mac it says to check the Internet connection and try again. My wifi is working fine on my mac and iPhone.

Any suggestions?