I’ve created a few custom taxonomies that I use on the custom post type that I am mapping. Despite me enabling both the post type and taxonomies to use REST API, I don’t see the taxonomies in the list of available options for the filter. Categories and tags are the only ones, apart from text search and post types, of course. Am I missing something or is the plugin incapable of filtering POI in the mashup map by custom taxonomies?
Aparently, when registering a custom taxonomy, you need to declare it as public and with enabled REST API access in order to use it as a filter. I was missing the public part in my definition, leading to the problem.