I think there's two ways to do it. One is in the app, you can choose curbside when checking out. There's also possibly call in. They have parking spots for these types of purchases, and I think you're given a number as well. I've usually picked up inside, so I'm not 100% sure. If I'm wrong, I'd suggest calling the store, and asking. They helped me out when I first started using the app for in-store pick ups.
James gave a good explanation. It's easy.
You shop on line pick store and pickup time arrive at store they bring the test
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