I believe that this is mostly because neither of them are available in the U.S. (as far as I know). Every single European service that I tried to use them with (note: I haven&#x27;t used plenty of them) accepted them without any issues.<p>As an example, while Amazon.com does not provide the support for them, Amazon.co.uk accepts my Visa Electron card without any issues and I bought a Raspberry Pi using Maestro.