Get the available widget styles. Use this when building a widget picker. Returns one entry per style. Send store_id to also get widget_add_ons: whether that location has an active widget add-on; without it, widget_add_ons is null.

Prerequisites: a bearer token. Optional: a location id (store_id) to check its widget add-on.

Authentication: Partner or Account token. store_id and company_id, when sent, must be inside your own account tree (a Partner token reaches any location under the partner, an Account token only its own); otherwise 422.

Rate limit: none.