Working with API - Passing Paramenters

Just starting out here bare with me: I have setup the API. I want to do a 'get' request. Now I have it returning everything, then we are supposed to parse through it. I seen the custom API tool where we can add our own SQL. -- How is the best way to go about limiting the get results to a value passed by the app? So the users put's their WalletKey in a text box in the app.

I would then limit the API results by only showing items with "their" WalletKey

select * from listeners where WalletKey = (HERE IS WHERE I"M STUCK)
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