AutoBill.redeemGiftCard

$abill = new AutoBill();
// autobill id for an existing subscription to which the customer
// wishes to redeem a gift card and add credit to the autobill
$abill->set('SBCR312345');
$gc = new GiftCard(); 
   // set the VID of the gift card, obtained when we checked the 
   // status of the gift card and determined that it was active
$gc->setVID($gcVID); 
// Now make the SOAP API call to redeem the gift card
$response = $abill->redeemGiftCard($gc);
if ($response['returnCode'] == 200) {
   // Redemption successful. Check if credit was added to the autobill
   $updatedABill = $response['data']->autobill;
   $availableCredits = $updatedABill->getCredit();
   $availableTokens = $availableCredits->getTokenAmounts();
   print "Available token credits: \n";
   foreach($availableTokens as $tkAmt) {
      print "Token type: " . $tkAmt->getMerchantTokenId() . " ";
      print "Amount: " . $tkAmt->getAmount() . "\n";
   }
   // Also make sure status of the gift card is 'Redeemed'
   $updatedGc = $response['data']->giftcard;
   print "Status of the gift card: ";
   print $updatedGc->getStatus()->getStatus() . "\n";
}
else {
   // Error while granting credit to the account
   print $response['returnString'] . "\n";
}