Call and ask.
In general - no, most places do NOT plug tires these days.
Just a matter of liability and practicality.
Liability as if they repair and it fails...easily could be a high dollar claim made...practicality as far as what do you make plugging a tire - $10-15 bucks. 1 single el cheapo Asian tire is what $50...and you can charge $15 for mounting...possibly upsell 4 tires or at least a better profit tire.
As to guidelines of can it be plugged...no sidewall damage (obvious reasons) and tire must be in good general condition (again obvious) and under 7 years old (look at date of manufacture on sidewall - google how to read it if you dont know - its simple).
Good luck