Contact and support

If you need help using HDTM, please email us at the address below.

Support email

Please include the company’s tax code, describe what you were doing and include any message shown in the app.

To protect your account, do not send your Cổng Hóa đơn điện tử password or any other password by email.

You can also find more information about using HDTM here: Guide · FAQ