PayPal widget not worrking

[Acorn]

Thanks both,
Acorn your script copied into a placeholder works OK, with my own ID credentials. This produces a payment button, but I'm looking for the add to cart option and then a checkout, this seems to be a pay now button for a single item.
I hoped the widget would be more user friendly than having to go through the Sandbox route on PayPal, well beyond me even understanding the jargon!
I have added donation button and a single item payment button on a few other sites, but hoped the widget would be able to be configured from inside Xara ion plain text

I just used https://www.paypal.com/buttons/.

Acorn