The SDK has a simple method, `purchase(package:)`, that takes a package from the fetched Offering and purchases the underlying product with Apple, Google, or Amazon.

The `purchase(package:)` completion block will contain an updated [CustomerInfo](🔗) object if successful, along with some details about the transaction.

If the `error `object is present, then the purchase failed. See our guide on [Error Handling](🔗) for the specific error types.

The `userCancelled` boolean is a helper for handling user cancellation errors. There will still be an error object if the user cancels, but you can optionally check the boolean instead of unwrapping the error completely.

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Warning: Automatic Transaction Finishing/Acknowledgement/Consumption

Transactions (new and previous transactions that are synced) will be automatically finished (acknowledged and consumed in Android), and will be made available through the RevenueCat SDK / Dashboard / ETL Exports.

You can use [observer mode](🔗) if you don't wish to have transactions finished (or consumed, in Android) automatically, but you will have to make sure that you finish/consume them yourself.

## Next Steps

• Don't forget to provide some way for customers to [restore their purchases ](🔗)

• With purchases coming through, make sure they're [linked to the correct user Id ](🔗)

• If you're ready to test, start with our guides on [sandbox testing ](🔗)