If the credit card is giving a system error, such as a timeout or gateway unavailable error, then contact Time Sync.
If the credit card is being declined, any available information on the decline is displayed. One example is a mismatch in the address. If no details are displayed, club management will need to contact their gateway provider (i.e. Authorize.net or whatever internet gateway provider your club is using) to find out the reason. The gateway provider should be able to let you know what the next step is.
To be 100% sure the problem is not in the Schedule Master code, club management can process the credit card directly through the site of the gateway provider to see if the same error results.
Additional details on AVS (Address Verification Service) errors or address mismatches:
The AVS logic is set by management of your organization on the site of their gateway provider (e.g. authorize.net). All cards are checked against logic set there (e.g. zip code match plus street address match or no match at all). The AVS data comes from the credit card issuing bank through the merchant provider. If your organization has set rigorous AVS enforcement, then there is no way to bypass it. The card holder may need to contact his card issuer to find out why it is declined with an AVS mismatch.
If you are getting this error and your credit card billing address has changed, please check to make sure that you have updated the address associated with the credit card. This is separate from the address in your user profile. Go to your payment account and click 'Edit' next to the card that needs to be updated. See image below for credit card edit screen.