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MLinAZ said:The first 4 numbers are generally the same for all cards for each company. There might be some variation but often Discover is like 6011, etc.
Start with the first 4 numbers and then work your way through I guess!
chefann said:That's sort of true. The first digit identifies the type of card (3 = American Express, 4 = Visa, 5 = MasterCard, 6 = Discover), but the first 4 identifies the issuing bank. Because there's only one bank that issues Discover cards, those are all the same first 4 digits.
Card numbers place digits in specific locations to create specific patterns. There's an algorhythm to figure it out, but I don't know it. (It's similar to the check that pharmacies do on doctors' DEA number when they fill prescriptions.) If any digit isn't correct, the algorhythm will spit the number out. And, for security reasons, it won't tell you which one is wrong. I'm willing to bet that if the host has a written copy of the number, not the card itself, that one digit is written incorrectly or illegibly.
chefann said:That's sort of true. The first digit identifies the type of card (3 = American Express, 4 = Visa, 5 = MasterCard, 6 = Discover), but the first 4 identifies the issuing bank. Because there's only one bank that issues Discover cards, those are all the same first 4 digits.
Card numbers place digits in specific locations to create specific patterns. There's an algorhythm to figure it out, but I don't know it. (It's similar to the check that pharmacies do on doctors' DEA number when they fill prescriptions.) If any digit isn't correct, the algorhythm will spit the number out. And, for security reasons, it won't tell you which one is wrong. I'm willing to bet that if the host has a written copy of the number, not the card itself, that one digit is written incorrectly or illegibly.
When your credit card is not recognized, it means that the merchant or company you are trying to make a purchase or transaction with is unable to process your credit card information. This can happen for a variety of reasons, such as an incorrect card number, expiration date, or security code.
There are a few reasons why your credit card may not be accepted. The most common reason is that the card information entered is incorrect. Make sure you are entering the correct card number, expiration date, and security code. Your card may also not be accepted if it is expired or if you do not have enough funds available.
If your credit card is not recognized, the first thing you should do is double check that you have entered all of the information correctly. If you are still having issues, contact your credit card issuer to make sure there are no issues with your account. You may also want to try using a different credit card or payment method.
If your credit card is not being recognized, it is important to make sure you are entering your information on a secure and trusted website. Look for the lock symbol in the browser bar and "https" in the URL to ensure that the website is secure. If you are still unsure, you can contact the company or merchant to confirm their security measures.
If your credit card is not recognized, you may still be able to make a purchase using a different payment method. Some companies or merchants may offer alternative payment options such as PayPal, Apple Pay, or a different credit card. If you are unable to use a different payment method, you may need to contact your credit card issuer to resolve any issues with your account.