Hi @Toby
I played a liitle bit with the Flarum api (register user, get posts, delete discussions, some simple filters, ...) and it works fine, but JSONAPI is there a comfortable php client to generate and parse JSONAPI response?
A (simple) php jsonapi client could make working with relationships / included data and some filters easier...
For example join data and included by relationship information together or more complexe filters or register a activated user (I have problems to set the is_activated flag via API call).