Can you see Apple partnering with someone and sharing the profit?
They don't need to partner with a "big name" because Apple are the biggest name.
They don't need to partner with a company for their database of people, Apple already have the biggest database of credit cards.
They don't need to partner for the tech, they have had it for years.
All they need is themselves. If they did that, they could easily undercut everyone and blow paypal out of the water.