2018 : This is headache for bloggers, youtubers or adsense publishers. “[Fix] Automatic payment declined: Western Union for $(value). No reason provided by your financial institution”. Lots of queries from Nepal, Pakistan, India and more other.
In 2014, this was published as a response,
No action is required on your part. We are working with Western Union to complete the configuration changes and will automatically reissue the payments. We expect to complete this in the next 24 hours.
Thanks for your patience, and we’re working to resolve this quickly.
Conclusion : Google is aware of the issue already. This is not first time for such kind of issues. Wait 24 hours. If not solved, wait for few days. This issue will be solved. You do not need to do anything from your side.