Equals
GET /api/v1/contact?$select=name,associateId&$filter=category equals 4 HTTP/1.1
Authorization: Bearer 8A:
Content-Type: application/json
Accept: application/json
One of
GET /api/v1/contact?$select=name,associateId&$filter=category oneOf (3,6) HTTP/1.1
Authorization: Bearer 8A:
Content-Type: application/json
Accept: application/json
Not one of
GET /api/v1/contact?$select=name,associateId,category&$filter=category notOneOf (3,6) HTTP/1.1
Authorization: Bearer 8A:
Content-Type: application/json
Accept: application/json