# Use Cases
source: https://developer.mastercard.com/payment-account-reference-inquiry/documentation/use-cases/index.md

###### [Token Association](https://developer.mastercard.com/payment-account-reference-inquiry/documentation/use-cases/implementation/index.md) {#token-associationdocumentationuse-casesimplementation}

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PAR can be used to link MDES tokens associated to the same PAN.

###### [Maintain Fraud Systems](https://developer.mastercard.com/payment-account-reference-inquiry/documentation/use-cases/implementation/index.md) {#maintain-fraud-systemsdocumentationuse-casesimplementation}

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Use PAR to maintain the value of fraud detection systems that have been dependent on the PAN today.

###### [Maintain Loyalty Programs](https://developer.mastercard.com/payment-account-reference-inquiry/documentation/use-cases/implementation/index.md) {#maintain-loyalty-programsdocumentationuse-casesimplementation}

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Use PAR instead of the PAN to link account holders to loyalty programs without the need to store sensitive card data.

###### [Transit Payments](https://developer.mastercard.com/payment-account-reference-inquiry/documentation/use-cases/implementation/index.md) {#transit-paymentsdocumentationuse-casesimplementation}

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Users can use device token to access transit system. A PAR could be useful to aggregate transactions for fare processing or allow users to link multiple form factors to single transit account. PAR can also be used for customer service and lifecycle management.