Uh oh! There are multiple reasons for a failed charge.
The best way to resolve this is to call your credit card provider (their support number is usually on the back of your card) and make sure that the transaction was not blocked. In addition, they are able to give you more insights as to why the charge was not approved.
Alternatively, you are able to send and email to Support@dapulse.com, and we will be able to help you figure out why your card was declined.