'querySelectorAll' on 'Document':

I used sample code,Create session to pay with card and CVC | Worldpay Developers 。

but the error was reported as follows

“Failed to execute 'querySelectorAll' on 'Document': '[object HTMLFormElement]' is not a valid selector.”

This is the sample

https://codepen.io/yangj90/pen/qBarmBN

thank you