keyfile in fist data Global Gateway Virtual Terminal

Question

Hai

I have created a test account in global gateway virtual terminal. I got the sample code to implement it. But there is a field to give key file,

$myorder["keyfile"] = "./YOURCERT.pem"; # Change this to the name and location of your certificate file

I know there is an option to get the Cert file in virtual terminal account. But here I saw another field

"please keyin tax id". What is this? From where I get this tax id, while emptying this field I got an error message "Keyin information did not match.” Please remember it’s a test account.

Does any one know this? Please help me? I am new to this check out integration

Thanks in advance