How to use consumable items at swift

How to use consumable billing items

I used SwiftyStorekit to implement consumable billing. However, I don't know how to use consumable items.

The code to purchase consumable items has already been implemented. However, even if you use items, the number of items you can get with SwiftyStoreKit.verifyReceipt remains at 1.

How can I reduce the number of used items in my possession?

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