Calling to WHMCS from an external page returns "Down for Maintenance" error!

[sufi]

I am trying to show total cart items from an external page. My WHMCS is located in "shop" directory and external page is in root.

 

I can show it perfectly with following code:

 

require("shop/dbconnect.php");
$totalitems = count ($_SESSION['cart']['products']) + count ($_SESSION['cart']['addons']) + count ($_SESSION['cart']['domains']);

if($totalitems > 0){
echo '</br><b>You have ' . $totalitems . ' item</b></br>';
}
else {
echo '</br><b>You have no item</b></br>';
}

 

But when I put this code in a function, and then call that function, I get an error message saying Down for Maintenance

An upgrade is currently in progress... Please come back soon...

 

Here is the code:

function ex_whmcs(){
require("shop/dbconnect.php");
$totalitems = count ($_SESSION['cart']['products']) + count ($_SESSION['cart']['addons']) + count ($_SESSION['cart']['domains']);
if($totalitems > 0){
 		return '</br><b>You have ' . $totalitems . ' item</b></br>';
 	}
 	else {
 		return '</br><b>You have no item</b></br>';
 	}	
}

 

Can someone guide me, what is the mistake I have done?

[sufi]

Thanks.

But I don't think I need to set an API for this. All I need to show is information on $_SESSION['cart'].

I was able to solve it. But having a different sort of error.

 

It works perfectly, when I put the require("shop/dbconnect.php"); in any file rather than header.php and functions.php (both are wordpress template files), and I am not sure what is causing that error.

 

I am trying to put this in a shortcode.

 

I don't know but take a look at:

 

http://docs.whmcs.com/API:Example_Usage