Reply To: metabox and fields

@ Seun Tayo

RE: becuase I am dealing with multiple field within a metabox, where do I add additional field within this code?

You would add that to the template card.php file as explained in the developer doc.

RE: will I have to duplicate the below and change the field_id to correspond with each field_id?

Yes, you will have to duplicate the code, once for each field your registered.

Hope this helps!