These changes went into effect on August 2nd 2021. Here is a PDF that has a breakdown showing all the changes that happened that day [1]
To PayPal's credit, this was their first rate increase in a very long time if not forever. That said this is a huge new fee for merchants while not providing any new services, at least at this time, to justify it.
[1] https://www.paypalobjects.com/marketing/ua/pdf/US/en/feepage...