K-BID requires a valid credit card upon registration to verify identity.
Transactions are approved/not approved by the card issuing bank; not K-BID. K-BID works with a processing network, it provides varying reasons for their decline responses. Sometimes they can be specific and provide responses such as Activity Limit Exceeded or Insufficient Funds. Other times their responses can be very generic such as Do Not Honor or Not Approved. The best way to help understand what is causing the non-approval would be to have you, the customer contact your card issuing bank for further clarification on why the card is being declined.