The best way to get an Official ESTA
How to find the national identification number on your passport. Esta.support explains it to you in this article. It is the number of the identity document other than the passport, issued by the country of residence. The national identification number is required for the following countries:
Belgium
Brunei
Chile
Estonia
Germany
Greece
Luxembourg
Malta
Monk
Holland
Portugal
Singapore
Slovakia
Slovenia
South Korea
Spain
Taiwan *
If you do not have the national identification number, you will need to mark it as UNKNOWN
* Taiwanese citizens also need a personal identification number
Esta.support was created to provide the assistance and support necessary to obtain Esta authorization to travel to the United States. Our customer service is available to answer all your questions and to facilitate your application process. Don’t hesitate to contact us if you have any doubts