Hi Mark,
Thank you for your purchase.

Sorry for late response. 

We are located in Serbia and our working time is from 10:00 to 17:00 CET. business days.

This is input is Stripe.js library and that library handle all related to this input. I think when you enter the card number from UK, it will recognize that card is from UK and it will remove ZIP code. This is the quote from their documentation:

"Note that ZIP and postal code validation depends on your customer’s billing country. Use our international test cards to experiment with other postal code formats"

So when I add card number from my country it doesn't require ZIP code to be added.

Best regards.

Hi Mark,

You are welcome. 

If you have any more issues or questions feel free to open a new ticket, we will gladly help.

I’d like to ask you a favor. Would you mind taking a few minutes to write a review for us, please on this link? 

Our free version is the only place where we can have proof for our hard work; your comments are beneficial for others to know what to expect when they’re looking for our plugin.

Thank you in advance. It means a lot to us, and I am looking forward to reading your comment.

Best regards.