Yes, I wrote my own service after Maciej (very politely, this is not a criticism!) asked grandfathered-in single-payment Pinboard users if they would consider a

Yes, I wrote my own service after Maciej (very politely, this is not a criticism!) asked grandfathered-in single-payment Pinboard users if they would consider a recurring payment. It's a simple Python / Flask app which runs on a host running Dokku.