I think it’s that PayPal was one of the firsts to provide a method for collecting credit card transactions electronically.
Before PayPal, you’d often have to visit a website, then call the phone number for the seller to collect payment.
eBay needed paypal because their sellers were often not businesses, just people yardsaling stuff online.
Coincidentally, I interned at a PayPal competitor in 1998 that went under during the bust. We had an electronic interface through MS access, but it was a still a human entering in the CC number into one of those dial pads on our side and then confirming the transaction. I’m sure with all of the concerns around security nowadays that you can understand why that was a terrible long term business model.
Thanks for the context. Here in the UK I never experienced a website that didn’t take payment via credit card directly as a first option - that’s always been there default, with some sites offering PayPal as a second or third way to pay.
And about punching the numbers manually then well, sometimes a bit of Mechanical Turk works just fine lol! :)
I deal with websites today that are optimized for PayPal first with worse second and third options.
A lot of websites with third party vendors rely on PayPal since it is the cheapest account for a seller with international access and PayPal handles the fraud investigation.