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# id

The offer identifier.

```
let id: String?
```

## Discussion

The [`id`](/documentation/StoreKit/Product/SubscriptionOffer/id) is a string that contains the alphanumeric offer identifier you provide when you configure an offer in App Store Connect.

This value is `nil` if the offer is an [`introductory`](/documentation/StoreKit/Product/SubscriptionOffer/OfferType/introductory) offer.

Pass the [`id`](/documentation/StoreKit/Product/SubscriptionOffer/id) to a method in [`purchase(options:)`](/documentation/StoreKit/Product/purchase(options:)) to create a purchase option based on the offer’s [`type`](/documentation/StoreKit/Product/SubscriptionOffer/type). For example, pass the [`id`](/documentation/StoreKit/Product/SubscriptionOffer/id) for a promotional offer to the [`promotionalOffer(offerID:signature:)`](/documentation/StoreKit/Product/PurchaseOption/promotionalOffer(offerID:signature:)) to apply the promotion to a purchase.

For more information about configuring offers in App Store Connect, see [`Product.SubscriptionOffer`](/documentation/StoreKit/Product/SubscriptionOffer).

---

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