I'm trying to buy the Double-Entry app. After confirming the card details I get the error "543335: Invalid bank merchant category". The number is the BIN for my bank.
Hopefully you have something more verbose in your logs to explain why the purchase failed.
Is there any way you can try with another card?
Tried a personal credit card from a different provider. Success:-)
Glad to see it worked now. Could you please send us (support[at]akaunting[dot]com) the name of the provider that failed so we could send it to our payment gateway and try to make it possible in the future?