curl --request GET \
  --url https://{instance}.omniapp.co/api/v1/users/email-only \
  --header 'Authorization: Bearer <token>'

{
  "pageInfo": {
    "hasNextPage": true,
    "nextCursor": "bob@example.com",
    "pageSize": 20,
    "totalRecords": 50
  },
  "records": [
    {
      "email": "alice@example.com",
      "user_id": "550e8400-e29b-41d4-a716-446655440000",
      "user_attributes": {
        "omni_user_email": "alice@example.com",
        "omni_user_name": "alice@example.com",
        "omni_user_id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
        "omni_is_org_admin": "false",
        "omni_user_timezone": "America/New_York",
        "department": "Engineering"
      }
    },
    {
      "email": "bob@example.com",
      "user_id": "550e8400-e29b-41d4-a716-446655440001",
      "user_attributes": {
        "omni_user_email": "bob@example.com",
        "omni_user_name": "bob@example.com",
        "omni_user_id": "b2c3d4e5-f6a7-8901-bcde-f23456789012",
        "omni_is_org_admin": "false",
        "omni_user_timezone": "Europe/London"
      }
    }
  ]
}