Is there a sample credit card number we can use for testing purposes? I don't feel very comfortable using my own for the testing of buying things I don't really want.
That depends on whether you are trying to test out a payment processing system or whether you are just using the internal uShop credit card validation routine.For example, if you want a test credit card with uShop's internal validation routine, you can use use 4111111111111111 (a 4 with 15 ones after it) and then use any valid future month/year for the expiration date.
If you need a test credit card for Authorize.Net or Linkpoint, you can find these on their website.