Apple on Thursday morning reported a number of issues with various iCloud services. According to the iCloud Status webpage, these problems are preventing many users around the world from making purchases in Apple's app and content stores.
In addition, “new and recently changed content may not have updated across devices for iCloud Drive, Backup, iCloud Notes, iWork for iCloud and Photos,” reads a notice on the webpage.
UPDATE: As of 9:10am PT, all of the affected iCloud services had been restored.