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# merchantCapabilities

A bit field of the payment-processing protocols and card types that you support.

```
var merchantCapabilities: PKMerchantCapability { get set }
```

## Discussion

The [`threeDSecure`](/documentation/PassKit/PKMerchantCapability/threeDSecure) and [`emv`](/documentation/PassKit/PKMerchantCapability/emv) values of [`PKMerchantCapability`](/documentation/PassKit/PKMerchantCapability) specify the supported cryptographic payment protocols. At least one of these two values is required.

Check with your payment processors about the cryptographic payment protocols they support. As a general rule, if you want to support China UnionPay cards, you use `capabilityEMV`. To support cards from other networks—like American Express, Visa, or Mastercard—use `capability3DS`.

To filter the types of cards to make available for the transaction, pass the [`credit`](/documentation/PassKit/PKMerchantCapability/credit) and [`debit`](/documentation/PassKit/PKMerchantCapability/debit) values. If neither is passed, all card types will be available.

---

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