Authorize.net is upgrading to CyberSource SCA. Will our payment gateway still work?
We updated the AuthorizeNet processor here: https://github.com/mattwire/com.donordepot.authnetecheck for both echeck and credit card.

However, it looks like AuthNet will not be supporting SCA (so you'll be fine for non EU payments) but will need to switch to Cybersource to accept EU payments via credit card.  It looks like Cybersource is supported by the Omnipay processor https://github.com/eileenmcnaughton/nz.co.fuzion.omnipaymultiprocessor