# Use Cases
source: https://developer.mastercard.com/payment-currency-conversion/documentation/use-cases/index.md

These example use cases demonstrate a cross-border funds transfer facilitated by this API. They are based on the graphical [Send money by app to a card](https://developer.mastercard.com/mastercard-send-experience-design-guide/documentation/design/payment-transfers/send-money-by-app-to-card/) flow in the Mastercard Send Experience Design Guide. In summary:

* Ali Young (the Sender) in the US is using a mobile funds transfer app to send money to Martha Jones (the Recipient) in the UK.
* You (the Originating Institution and Ali's card issuer) provide the app and hold Ali's sending card account, which is in US Dollars (USD). You are a Mastercard customer and perform settlement in US Dollars.
* Martha's receiving card account is in Great British Pounds (GBP), held by another issuer (known as the Receiving Institution).

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Overall flow:
Diagram mastercard-send-sequence-ccc-overall

To demonstrate each type of API call, we've split this flow into these detailed flows:

* [Get Conversion Details](https://developer.mastercard.com/payment-currency-conversion/documentation/use-cases/conv-details/index.md) --- The main flow with **Conversion Rate Details** API calls to get the latest currency conversion rate information.

* [Get Currencies](https://developer.mastercard.com/payment-currency-conversion/documentation/use-cases/currencies/index.md) --- The currency selection part, which is facilitated by a **Currencies** API call to get the latest list of currencies for which Mastercard publishes rates daily.

## Further details {#further-details}

The [API Reference](https://developer.mastercard.com/payment-currency-conversion/documentation/api-reference/index.md) information describes how you can use the different API GET requests and shows sample messages.

The [Error Codes (Reason Codes)](https://developer.mastercard.com/payment-currency-conversion/documentation/codes-and-formats/index.md#error-codes-reason-codes) section describes the API error responses.