Issue with saving AfterPay Open invoice payment method for Austria

Hi,

we found an issue with saving AfterPay Open invoice payment method for Austria.
Everytime you save the AfterPay Open Invoice Settings for DE (Germany) the settings for the same payment method but for AT (Austria) are getting wiped.

This is because of the wrong PHP “extends” in the file “class-wc-gateway-afterpay-at-openinvoice.php”.

Needs to be changed from “WC_Gateway_Afterpay_De_Openinvoice” to “WC_Gateway_Afterpay_Base_Rest”. Please fix this issue and provide an plugin update.

Thanks,
Michael