During the card activation process, you can select both a Main and an optional Fallback payment asset. These will be used to fund your card payments. The Main payment asset is the default asset to cover your transaction. If the balance of your Main payment asset is too low to fund the transaction, your card would normally be declined. In this case, however, the Fallback asset jumps into action and covers the respective payment to avoid a failed transaction. Note: You can change the main and Fallback asset at any time via the Bitpanda mobile app.