Dropbox displays an error message if a payment is declined. This alert appears in a red box at the top of the page after you submit your credit card information. However, the error code and associated text is not always useful for troubleshooting potential issues.
In most cases, credit card declines are easily fixed by reentering your billing information or by contacting your specific payment vendor directly for assistance.
If you're repeatedly encountering a failed credit card payment, you can change your payment method to Paypal with the following steps.