Reading about the Coinbase Commerce Payments Protocol that will power USDC on Shopify. If I understand correctly, the protocol allows implementing rules similar to the rules currently enforced by Visa and Mastercard:
✔️ The protocol introduces two concepts: "Escrow" and "Operator"
✔️ Funds from payers are collected into the "Escrow" before being transferred to the merchant
✔️ The "Operator", which can be an "advanced smart contract", facilitates the transfer of funds from the "Escrow" to the merchant (or back to the payer)
✔️ "The protocol is not concerned with how the operator is implemented and just recognizes it as an address"
...so Visa or Mastercard can build their own "Operators" that implement the scheme's rules through smart contracts.
How cool is that?!!!
$COIN $V $MA

From here:
Implementation of merchant discount rates:
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