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Why am I unable to enter 16 digits of a Visa card? Entering last digit, alerted too many numbers..

When I enter the last digit of the 16 numbers of a Visa card, the numbers turn red and 'shake', apparently an alert that I've enterd too many numbers...? This is on my mobile phone app (all I have) and hasn't happened in the past. Thanks for any help.

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Super Seller Alumni

That means that the number you are entering is not a valid number.  Check the card number.

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Super Seller

A card’s numbers will turn red if the information entered is incorrect, or it is not a supported card (Visa, MasterCard, AMEX, or Discover).  A Visa must start with the number 4.

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