Just to clarify our position:
This plugin currently implements Adyen's classic integration (
https://docs.adyen.com/online-payments/classic-integrations), which has reached end-of-life. As of 1st October 2022, no more transactions will be allowed for HPP (
https://docs.adyen.com/online-payments/classic-integrations/hosted-payment-pages/deprecation).
As such, the plugin is in maintenance mode.
I know there is an effort underway to provide an open-source Adyen plugin which supports the new Online payments APIs, including support for the new checkout API only integration method (which replaces Client-Side Encryption) and support for the new Pay by Link flow, which replaces the old HPP. I am unable to provide a timeline at this time though.
Hope this clarifies things!