Dec 28, 2019 09:19:07 PM by Usama A
Dec 28, 2019 11:26:38 PM by Filip K
It should be on the client side.
Most likely there is a problem with his bank account - probably not enough money on it, or changed card.
Good news is you are covered if you used the Upwork App to track app, using comments to describe your work.
Bad news is you are not covered if you use manual time, like I do :).