Ask HN: How do market place startups collect payments?

All marketplaces like (eg: Vayable) collect payments from one party and then send that payment to a third party after taking a cut. I've seen that most payment systems (including Paypal, Amazon, Google, Stripe) do not allow these kind of transactions per their terms of service.

These are known in the industry as Third Party Payment Aggregators (ie like Amazon, Paypal themselves) and its very hard if not impossible to get a payment service to take you on if your doing this kind of a business.

How do these startups get around this?