get https://{account}.piwik.pro/api/tag/v1//variables
JSON API compatibility divergence
Filters
In JSON API standard (https://jsonapi.org/recommendations/#filtering) one can request elements with multiple
filter values by simply providing them separated by coma:
variables?filter[variable_type]=url,constant
This notation will not work here. You can achieve this functionality by providing multiple filters for the same parameter:
variables?filter[variable_type][]=url&filter[variable_type][]=constant