Custom field with underscore in link

I apologize if this has already been asked a bunch of times.  It looks like other people have various forms of this question but I haven't found an answer that works for me.

I'm trying to put a custom field named person_key into a web link url.

I've tried various forms (12 so far) of the following:

https://www.my_site.com/ws/afco_car_kits.php?id=[[person_key]]

I want to link to my_site.com, subdirectory ws, file name afco_car_kits.php, with a GET parameter of id=xxx,

where xxx is from the person_key custom field in the contact record. 

So far, all my efforts have resulted in the correct URL, right up to and including ?id=.  The id parameter itself is always blank.

How to I write the link to pick up this custom field?  Thanks,

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