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Uber uses Stripe and PayPal to process payments. They don’t need to reimplement either, and doing so would be a bit of a waste.

It’s worth pointing out that not all of the 2200 services may be user-facing. Some may be internal, such as admin tooling or CI services. That said, 2200 seems like a lot!

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Sorry, I think you are a bit mistaken about how payment platforms work. Stripe and PayPal provide an interface to a country's banks. In exchange for abstracting away the underlying bank infrastructure, you pay them a fee for every transaction. Stripe and PayPal support a limited number of countries and a subset of the bank's functionality. So if you want to interact with any new countries or access any non-supported financial instruments, you'll have to directly integrate with the banks and implement those yourselves. To give you a sense of scale, Uber's payments volume is like 10% of Stripe's.

Curious; where did you get the 10% number from

Here's an estimate of Stripe's yearly transaction volume at $200 billion https://www.forbes.com/sites/christianowens/2019/09/21/strip...

Here's Uber's announced results of $18 billion in gross bookings https://investor.uber.com/news-events/news/press-release-det...

Round that to significant figures and you get 10%.

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