XWDP19, as far as I can check does have access to a large number of third-party widget including PayPal.
Is your XDA still in Update Service cover?
If so, you can get these from OCC > Components > Print & Web Components > eCommerce.
If you have ever used them with any XDA, the download will exist as paypaladdtocart.xwr, paypalbuttons.xwr, paypalbuybutton.xwr & paypalviewcart.xwr.
There is no forced subscription in using these widgets.
Elsewhere I have even shown how you can build and use your own.
Acorn
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