curl --request GET \
  --url https://{tenantDomain}/my-org/v1/members/{user_id}/roles \
  --header 'Authorization: Bearer <token>'

{
  "roles": [
    {
      "id": "rol_SO2j0sFo9NFa3F9w",
      "name": "role1",
      "description": "role1 description"
    },
    {
      "id": "rol_BO2j1sFo9NFa3F9w",
      "name": "role2",
      "description": "role2 description"
    }
  ]
}