Due to controversial changes to Paypal, in protest of them forcing a fee to refund (although we don’t do refunds on donations), in principle, we cannot accept donations through Paypal until they reverse this change that hurts customers and sellers. However, Fastspring, which is our payment processor for donation licenses are not affected by this.
You can see the video why we are doing this. If you want to support development, you may still do so by obtaining a donation license, through the Tip Jar on the iOS/macOS apps or supporting us through Patreon.