title: how to check if the credit card is valid or not for paypal
body: <p>I have to take the user credit card details for payment through paypal.
  The first time the user enters the card's details the payment is done through paypal pro.
  If the card is not valid, the payment will not be done. The payment will be done only if the card is valid.</p>
  
  <p>The first time the user enters a valid card details and the payment is done, if such user modifies the credit card details at that time i need to check again if the card is valid for paypal or not.</p>
  
  <p>So are there any APIs which only check the credit card details and not process any payment?</p>
  
  <p>I am running php and mysql.</p>
  
  <p>Thanks.</p>
  
  <p>Avinash</p>