Most of them have promised to issue refunds to customers if and when they get refunded the money.

FedEx:

> Our intent is straightforward: if refunds are issued to FedEx, we will issue refunds to the shippers and consumers who originally bore those charges. When that will happen and the exact process for requesting and issuing refunds will depend in part on future guidance from the government and the court.

https://www.fedex.com/en-us/shipping/international/us-tariff...

Thanks for that reference. I can only hope. Unfortunately, I just paid a UPS bill for the new tariffs.