There are multiple reasons why your card might be getting declined.
wrong expiration date
wrong CVV code
wrong zip code
Additionally, it is possible that your credit card company is declining a charge for security concerns. We recommend contacting your credit card company and asking if there is some sort of a block on the charge. Often times they will be able to explain why the card is being declined. If you still have an issue purchasing a subscription to Dubb, please report back any new findings.
If you are already subscribed and you need to update your credit card information
visit dubb.com/settings/payment-method (while logged into your Dubb account)