CCavenue Payment gateway is simple to integrate and the following are things you need before integrating.
We need a merchant id and working for implementing payment gateway
These two details will be given by CCavenue
They use a redirect model for payment
ie the user will be redirected to there site for making the payment
Before for sending the details to CCavenue, we need to save the details so that we can verify the details after the payment
we need to generate a signature(checksum) that is it contains some details like amount, orderid, working key, merchantid and redirect URL
On the buy page on submitting we need a serverside validation of the details, the user has entered and after that, the user details need to be stored in our DB after the payment is successfully completed
After entering all the details we need to redirect to another page it contains a form and the CCavenue form variables which are in hidden and we need to auto submit after loading the page.
This is the First page before payment.
<?php
$Merchant_Id = "your_merchantid";//
$Amount = "amount";
$Order_Id ="orderid";//unique Id that should be passed to payment gateway
$WorkingKey = "working_key";//Given to merchant by ccavenue
$Redirect_Url ="sucessurl";
$Checksum = getCheckSum($Merchant_Id,$Amount,$Order_Id ,$Redirect_Url,$WorkingKey); // Validate All value
//creating a signature using the given details for security reasons
function getchecksum($MerchantId,$Amount,$OrderId ,$URL,$WorkingKey)
{
$str ="$MerchantId|$OrderId|$Amount|$URL|$WorkingKey";
$adler = 1;
$adler = adler32($adler,$str);
return $adler;
}
//functions
function adler32($adler , $str)
{
$BASE = 65521 ;
$s1 = $adler & 0xffff ;
$s2 = ($adler >> 16) & 0xffff;
for($i = 0 ; $i < strlen($str) ; $i++)
{
$s1 = ($s1 + Ord($str[$i])) % $BASE ;
$s2 = ($s2 + $s1) % $BASE ;
}
return leftshift($s2 , 16) + $s1;
}
//leftshift function
function leftshift($str , $num)
{
$str = DecBin($str);
for( $i = 0 ; $i < (64 - strlen($str)) ; $i++)
$str = "0".$str ;
for($i = 0 ; $i < $num ; $i++)
{
$str = $str."0";
$str = substr($str , 1 ) ;
}
return cdec($str) ;
}
//cdec function
function cdec($num)
{
for ($n = 0 ; $n < strlen($num) ; $n++)
{
$temp = $num[$n] ;
$dec = $dec + $temp*pow(2 , strlen($num) - $n - 1);
}
return $dec;
}
?>
<form id="ccavenue" method="post" action="https://www.ccavenue.com/shopzone/cc_details.jsp">
<input type=hidden name="Merchant_Id" value="Merchant_Id">
<input type="hidden" name="Amount" value="Amount">
<input type="hidden" name="Order_Id" value="Order_Id">
<input type="hidden" name="Redirect_Url" value="success url">
<input type="hidden" name="TxnType" value="A">
<input type="hidden" name="ActionID" value="TXN">
<input type="hidden" name="Checksum" value="<?php echo $Checksum; ?>">
<input type="hidden" name="billing_cust_name" value="name of user">
<input type="hidden" name="billing_cust_address" value="address of user">
<input type="hidden" name="billing_cust_country" value="user country">
<input type="hidden" name="billing_cust_state" value="state of user">
<input type="hidden" name="billing_cust_city" value="city">
<input type="hidden" name="billing_zip" value="zip/pin code">
<input type="hidden" name="billing_cust_tel" value="telphone no">
<input type="hidden" name="billing_cust_email" value="emailid">
<input type="hidden" name="delivery_cust_name" value="user name">
<input type="hidden" name="delivery_cust_address" value="delivering address">
<input type="hidden" name="delivery_cust_country" value="delivering country">
<input type="hidden" name="delivery_cust_state" value="delivering state">
<input type="hidden" name="delivery_cust_tel" value="telphone no">
<input type="hidden" name="delivery_cust_notes" value="this is a test">
<input type="hidden" name="Merchant_Param" value="">
<input type="hidden" name="billing_zip_code" value="zip/pin">
<input type="hidden" name="delivery_cust_city" value="city">
<input type="submit" value="Buy Now" />
</form>
After payment to get the Payment Gateway Response. After the successful payment, CCavenue will redirect to our success URL with some details as post URL/get URL
There are mainly 3 auth_status are there they are
Y successfully authorized by the gateway.
N Unsuccessful transaction.
B not authenticated at this point in time.
We need to verify the payment gateway details send by CCavenue has tampered or not for that we have to use the Verify checksum function.
//Verify the the checksum
function verifychecksum($MerchantId,$OrderId,$Amount,$AuthDesc,$CheckSum,$WorkingKey)
{
$str = "$MerchantId|$OrderId|$Amount|$AuthDesc|$WorkingKey";
$adler = 1;
$adler = adler32($adler,$str);
if($adler == $CheckSum)
return "true" ;
else
return "false" ;
}
//functions
function adler32($adler , $str)
{
$BASE = 65521 ;
$s1 = $adler & 0xffff ;
$s2 = ($adler >> 16) & 0xffff;
for($i = 0 ; $i < strlen($str) ; $i++)
{
$s1 = ($s1 + Ord($str[$i])) % $BASE ;
$s2 = ($s2 + $s1) % $BASE ;
}
return leftshift($s2 , 16) + $s1;
}
//leftshift function
function leftshift($str , $num)
{
$str = DecBin($str);
for( $i = 0 ; $i < (64 - strlen($str)) ; $i++)
$str = "0".$str ;
for($i = 0 ; $i < $num ; $i++)
{
$str = $str."0";
$str = substr($str , 1 ) ;
}
return cdec($str) ;
}
//cdec function
function cdec($num)
{
for ($n = 0 ; $n < strlen($num) ; $n++)
{
$temp = $num[$n] ;
$dec = $dec + $temp*pow(2 , strlen($num) - $n - 1);
}
return $dec;
}
we need to pass the details into it, if it returns true then the details are ok and payment was successful redirect to success page
if it returns false then the details have tampered while sending to our application and something wrong has occurred and redirect to a failed /unsuccessful page
Check out the below link for more details in ccavenue site.
click here to see user manual
Arjun is a Full-stack developer, who is fond of the web. Lives in Chikmagalur, Karnataka, India
