# Card Replace
source: https://developer.mastercard.com/benefit-allocations-service/documentation/use-cases/card_replacement/index.md

#### Overview {#overview}

Replaces the card number associated with the user by taking an existing card number, new card number and effective date in the input. The benefits on the existing card number are expired, and the same set of benefits are applied to new card number using the given effective date. The benefit allocation service card replace service can:

* Replace a card.

Diagram card_replace

### Use Case 1: card replacement {#use-case-1-card-replacement}

1. Cardholder requests a new card.
2. Issuer sends a request with an old card number, new card number and effective date as an input parameter
3. Benefit Allocation Service API returns the segment benefit codes replaced with effective and expiration dates. Segment bundles are associated to the card using the effective date of the previously expired card.

## Additional Information {#additional-information}

1. Look at the [API Reference](https://developer.mastercard.com/benefit-allocations-service/documentation/api-reference/index.md) for information on how to implement this use case.
2. Look at the [Code and Formats](https://developer.mastercard.com/benefit-allocations-service/documentation/code-and-formats/index.md) for acknowledgement responses.