When an order has multiple customers, is there a way to figure out which customer belongs to which payment via the rest api? Or how much each customer paid?
I don't believe so. Customers belong to orders, not payments. In a split scenario it is the payment that is split, not the order. This seems to be confirmed on the Clover merchant dashboard -> customers. In a split scenario a customer will be associated with the order and the full amount of the order will be listed.
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