Get basket items

Think of this as the "show me my cart" endpoint.

Use it any time you need the full, current list of basket items, for example:

• loading the basket page
• refreshing after add/update/remove actions
• showing item-level basket details before checkout

How it works:

• You pass a basket ID in the path.
• The API returns the full item list for that basket.

Good to know:

• Basket IDs are caller-generated unique identifiers.
• The basket becomes associated with the user who first modifies it.
• Once owned, other users cannot update that basket.