How to use "Pay API Example"

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I see it working fine in the iframe of this page:
https://www.wix.com/code/home/example/Pay-API-Example
But i cant get it working when i use the wix editor/preview
the error i get is:
Uncaught (in promise) Error: WixPayBackend.createPayment: can’t create payment, details:
Total amount should be the sum of the item amounts