There are several options how to sponsor the engine development:

1. Boosty (opens new window) - this is the preferable way of sponsoring, however it sometimes have issues when processing subscriptions. If this happen to you, use one of the next options.
2. Bitcoin - bc1qgumrvvu74qrw6reda8dj7a2fdfr9xv5lz0akfl
3. Patreon (opens new window) - this is the least preferable way of sponsoring, see details here (opens new window)