Mastercard’s partnership with Chainlink integrates key players, including Zerohash, Shift4 Payments, XSwap, Swapper Finance and Uniswap, using Chainlink’s interoperability protocol to enable secure transaction data exchange between Mastercard’s network and multiple blockchains

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To make it possible for "over 3 billion cardholders in the Mastercard user base" to use their card to buy crypto, Chainlink is working with, or leveraging technology provided by Zerohash, Swapper Finance, Shift4 Payments, XSwap, and the Uniswap
The service integrates multiple players, including Shift4, zerohash, XSwap, and Uniswap, with Chainlink's interoperability protocol facilitating transaction data exchange between the card network and multiple blockchains.