PayTrace has confirmed that the issue is on Cielo's (MES) end. Their team has all hands on deck trying to resolve the issue. They are putting together communication regarding the issue, and asked everyone impacted to be on the lookout for that update.
If you have any questions in the meantime, please contact Cielo (MES) 24/7 Customer Care Team @ 1-888-288-2692 or email email@example.com
The PayTrace Team