If you cannot add a payment method to Knewton.com, please verify: 

  • You are only using a debit or credit card. We do NOT accept prepaid cards or gift cards.
  • All your information is correct, including: first name, last  name; card number, expiration date, and CVV. 
  • The billing address on your subscription is correct and matches the information tied to your credit or debit card account.
  • The card is not expired.  
  • There are no extra dashes or spaces in the card number. 
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