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Shopify - How to programmatically add a product to a cart with a custom app extension?

Solution:

how do I add an item to the cart?

Check out the Shopify AJAX API (https://shopify.dev/docs/api/ajax). The cart reference documentation (https://shopify.dev/docs/api/ajax/reference/cart) details how to query for what items are already in the cart and how to add items.

Admin API? Would I be using GraphQL?

No. The endpoints under these APIs require authentication so definitely don't use them client side from the storefront.
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