Hi,
I was trying to add 5 euros to my Steam wallet and then this message showed up when I clicked on Purchase on Steam app:
"Your purchase has not been completed. The payment processor has reported an authorization failure. Please select a different payment method."
Everything went well on Checkout page for PayPal, where I chose my Visa Electron debit card and for the currency to pay in I chose Euro.
Solved: Checked with my bank account and figured out that I need to have more money on my card because of the conversion types.
