They have stalls you park in you push the red button and they place your order then you eat in said stall
Just go inside and place your order for pickup and wait for it or if it's available there may be an application online from Google Play that you can download which might let you order in advance and then go pick it up
GO TO THE ORDER WINDOW
You don't. Maybe you can knock on window, but that's not easier than the speaker system.
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