While you can use your Expend card anywhere you can use a Mastercard-branded card, you may encounter the following:
TfL (Transport for London) charges don't appear immediately, but are usually taken as a combined amount for all your journeys the day after you travelled.
Cashback isn't possible with prepaid cards.
Direct Debit isn't currently supported.
If you encounter any other situations where you can't pay with your card, please let us know.