Passing variables to an API from a program using that API

Hi, I need to know if its possible for a program to pass variables to an API that the program is using.
For instance, in my API I want to use 'modem' that was declared in my program:

modem = peripheral.wrap(settings.modemside)

but my API doesn't know what 'modem' is, so I can't use modem.transmit() inside my API.

Having the api wrap the modem would be the logical solution…

api.modem = modem

This will change the api's local modem variable to whatever the variable modem in your current script points to.

Not really local.
I think the most "correct" solution here would be to pass the modem to any function that uses it.

api.modem is not the same as _G.modem, ergo it is local to the api enviroment.

But yeah, passing the peripheral table sounds like a better solution