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Q: 

[Payment/Paypal] How can I integrate my custom shopping cart that contain items from multiple sellers (different Paypal Accounts) and checkout the buyer in 1 button?

I have looked through this problem, and the Express Checkout API seems to only allow a single seller (correct me if I'm wrong), while they too have the MassPay API, but the chargeback is on the buyer, not the seller, which wouldn't be fair.

Any ideas how I can implement this? A 3rd party cart, uploading its contents from various sellers and checking it out in a single step? Thanks.

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