After entering my valid info to complete the $19.99 upgrade from GarageSale 7 to 8 (because 8.0b53 now says “You have used GarageSale without a license for 30 days. Please buy a license to keep using GarageSale.”), it reports “Our server encounters an error, please contact our support at support@iwascoding.com.” when I click the Pay Now button after entering my credit card information.
I am running macOS 10.15b4 build 19A526h on a 2017 retina 5K 27" iMac.
this could have been just a temporary issue with the payment server. Your purchase didn’t go through as far as I can see.
Can you please give it another try and let us know if it’s working now?