# API Authentication
source: https://developer.mastercard.com/open-finance-europe/documentation/unlicensed/insights/api-basics/api-authentication/index.md

All endpoints require client authentication via headers containing your `Client ID` and `Client Secret`:

    X-Client-ID: <CLIENT_ID>
    X-Client-Secret: <CLIENT_SECRET>

Refer to the [Quick Start guide](https://developer.mastercard.com/open-finance-europe/documentation/unlicensed/insights/quickstart/index.md) for detailed steps on authentication.