Linking a few thoughts here...
$AMZN among the largest payfacs given its substantial 3P seller marketplace GMV Amazon Pay volumes (in aggregate likely $500B )
Assuming nearly 150bps net yield given its scale and favorable economics (all this is CNP running over Chase) ...
Good thread here explaining difference between using a payfac (e.g. Stripe) and being one (e.g. Toast, Mindbody, FreshBooks)
The latter enabled by payfac-in-box players like Finix, Infincept, Payrix, etc.
Use case is typically SMB software wanting to capture “payments” revenue