For example, with T-mobile, I can register my credit card, and if I use that credit card at any of the participating outlets, I can earn cashback. Similarly, if I register a non-Bilt credit card with Bilt, then I can earn Bilt points on ‘eligible spend’. How are they able to access my credit card transactions? and are they getting access to only the participating outlets, or all of my transactions? and what do they gain by doing these schemes other than increasing their brand value?
The participating outlets will see the transactions they participate in and share when you pay.
It’s an incentive to use their services and keep using their services over others.