In a partner-funded reward, the cost of the earn or the redemption sits with a partner, not the program operator. A retailer inside an ecosystem might fund bonus points on its own products to pull members into its stores, or a partner might underwrite a redemption because it wants the traffic. Either way, the program has to attribute the cost correctly and settle it, so money moves to match who actually bears the expense.
Consider a fuel retailer in a shared program that funds double points on fuel purchases. Members earn extra, the fuel brand pays for those points because they drive volume to its forecourts, and the program settles the funded amount with the retailer. The anchor operator carries none of that particular cost while members experience one program.
For an enterprise operator, partner-funded rewards are how an ecosystem stays affordable as it grows. Each partner that funds its own earn or redemption offsets program cost and adds member value. The requirement is rigorous attribution and settlement, because without accurate accounting of who funded what, the economics of a multi-partner program become impossible to manage.