Version 1 Update Checklist {#uc_v1_migration_checklist}
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You must complete these tasks before you can complete your migration from `Unified Checkout` v0 to v1:

* Replace `new Accept(session).unifiedPayments()` with `await VAS.UnifiedCheckout(session)`.
* Replace `up.show(options)` with `checkout = await client.createCheckout(); checkout.mount(target)`.
* Update container options: `{ containers: { paymentSelection, paymentScreen } }` becomes direct arguments to `mount()`.
* Replace `up.complete(token)` with `checkout.complete(token)` or use `autoProcessing: true` to complete transactions automatically
* Replace `up.hide()` with `checkout.unmount()`.
* Replace `up.dispose()` with `checkout.destroy()` and `client.destroy()`.
* Add event listeners for observability. For example, `client.on('error')` and `checkout.on('ready')`.