List Customer Groups

Endpoint	Method
/api/admin/customers/groups	GET

Query Parameters

Parameter	Type	Description
page, per_page	integer	Pagination (default 10, cap 50).
code	string	Partial code match.
name	string	Partial name match.
is_user_defined	integer	0 (system) or 1 (user-defined).
sort	string	id (default desc), code, name.
order	string	asc, desc.

customersCount is detail-only — null on listing rows.