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# subscribe()

Initiates a purchase when a customer activates a control to subscribe to the option.

```
func subscribe()
```

## Discussion

Call the [`subscribe()`](/documentation/StoreKit/SubscriptionStoreControlStyleConfiguration/Option/subscribe()) method within your custom style when the customer chooses to make a purchase.

> Important:
> Don’t call purchase methods, such as ``doc://com.apple.storekit/documentation/StoreKit/Product/purchase(confirmIn:options:)-8eai6``, on the ``doc://com.apple.storekit/documentation/StoreKit/SubscriptionStoreControlStyleConfiguration/Option/subscription`` property from your custom style.

---

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