For a one-time donation (debit card, Revolut etc), the best option is via Buy Me a Coffee. You do not need to create a profile to use this service.
Click on the image to visit the Buy Me a Coffee website.
Check out the new RR merchandise shop on Etsy. Orders are created at Gelato. Get in touch for custom designs! RR makes a small commission on all sales.
Select the logo to visit the Etsy website and browse the RR merch.
For other methods, get in touch using the contact page