We have set up a Patreon to handle recurring contributions. You can read about it here. As with anything new, there may be issues. I’ve tried to head off as many as possible on that page. Let us know if you run into new, exciting, unanticipated issues.
We will be setting up something to handle one-time contributions after the Patreon is more or less squared away and we answer all the exciting back-end issues brought up by writing contributor rewards into the code.