Elastic Commerce has a great post on 12 checkout blunders that lose customers.
Take a couple of minutes to buy something from your winery Web site and see if any of them apply to you.
BTW, all the major credit card issuers provide "test" credit card numbers, e.g.
| American Express | 3782-822463-10005 |
| MasterCard | 5555-5555-5555-4444 |
| VISA | 4111-1111-1111-1111 |
which are valid digits, but non-existent accounts.
Change one digit and you've got yourself an error to test with (card numbers include a check digit based on what is called a Luhn code).
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