I have successfully integrated the Square IOS SDK into my app. I would like to create an SCCAPIRequest which specifies an amount to be taxed and an amount to not be taxed, in my case labor. I haven’t seen any way to do this.
You should set up your taxes inside the Square Point of Sale app, and if you don’t override them with clearsDefaultFees they will automatically be applied to your transaction.
Partial taxation like you described is not currently possible. You can calculate the total yourself and pass that instead.