Coinbase will be conducting a scheduled technical systems upgrade starting Saturday, March 4 2023 on or around 8 AM PT. They expect this process to take up to 8 hours to complete, however, this estimated time is subject to change.
For more details, you can follow their status page over here: https://status.coinbase.com/incidents/w329bzjlvf9l
During this time, cryptocurrency transactions may not work correctly. It is advised to avoid paying via cryptocurrency mode of payment until further notice.