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I'd be interested in anybody explaining why a welcome page needs assets from 17 other domains, including paypal and stripe.

Why are multiple payment processors included on this page that doesn't involve any payment?

pptm.js is paypal's tag manager, for "Marketing Solutions". Gives the vendor shopper insights (clickthru, etc).

Stripe recommends putting stripe.js on every page to help detect fraud better (https://docs.stripe.com/js/including)