One time donation?

I wish I could donate ONE TIME to Eternity dev so he know that there's still people that love his work, but the only platform to donate that I found in Eternity's Codebers is Liberapay which I couldn't find an "one time" donation, just subscriptions (weekly, monthly or yearly) and yeah, there's "manual renewal" but I don't want to have reminders of my one time donation.