> ## Documentation Index
> Fetch the complete documentation index at: https://primer.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

Calling [showUniversalCheckout](/sdk/web/v2.x.x/primer/methods/showUniversalCheckout) returns a Promise that resolves after the Drop-In Checkout has been initialised with an instance of `PrimerCheckout`.
This exposes some methods which can be called to perform actions like:

* [updating the client session](/sdk/web/v2.x.x/primer-checkout/methods/refreshClientSession)
* [submitting manually a form](/sdk/web/v2.x.x/primer-checkout/methods/submit)
* [disabling tokenization and payment creation](/sdk/web/v2.x.x/primer-checkout/methods/setTokenizationEnabled)

See the methods for more details on each action.