I got an email from JW Marriott that had this in it:

Thank you for choosing JW Marriott Phu Quoc Emerald Bay as a destination of luxury experiences.
Your invoice was issued with the detail as below:

- Khách hàng / Công ty (Guest / Company): Khach Le
- Mã số thuế (Tax Code):
- Mã khách hàng (Customer Code): 9196820XXXXXXX
- Số hóa đơn (Invoice No.): 00018477
- Mẫu số (Form No.): 1/004
- Kí hiệu (Serial): C25MFO
- Số Fkey (Fkey No.): 52e6aceaa38

Looks like Khach Le? The customer code and Fkey No. is blocked out incase it is important.