Is it possible to add Custom attributes "customer" or "address form fields" in one page checkout?

Hello,
I want to add 2 additional form fields to "Customer" and "Address" e.g. "ID card number"

Is it possible to make use of the nC standard backend configuration?
configuration > Customer form fields > Custom customer attributes > add new

Custom customer attributes
If the default form fields are not enough for your needs, then you can manage additional customer attributes below.

"add new"
Identity card number

Or any other way to add customized form fields?

Thanks for feedback

Hi,

The One Page Checkout plugin does support custom address form fields, so you can use them without any problems.

Hope this helps!