[Done v1.3.9a] Addition to last Linkpoint Patch

The Linkpoint patch provided here:

http://www.zen-cart.com/forum/showpost.php?p=563490&postcount=22

was still not working for a client of mine when a gift certificate was used. The error message was, "subtotal does not match the amount being charged."

The associated LinkPoint error number is SGS-002301.

Fix and additional notes provided below.

The situation is caused by the use of a GV, but the issue is that because of the gv, the shipping is greater than the total, so even excluding the subtotal doesn't fix the problem. I will post a patch asap.

It's a small extension to the new logic to hide the subtotal when there are discounts.

    // if discounts apply, do not send subtotal, otherwise validation error occurs
    if ($credits_applied_so_skip_subtotal) {
      // Look for an anomaly in the total
      $tot = 0;  
      if (isset($myorder["shipping"])) $tot += (float)$myorder["shipping"];
      if (isset($myorder["tax"])) $tot += (float)$myorder["tax"];
      if (isset($myorder["subtotal"])) $tot += (float)$myorder["subtotal"];
      if ($tot > (float)$myorder["chargetotal"]) { 
          unset($myorder["shipping"]);
          unset($myorder["tax"]);
      }   
      unset($myorder["subtotal"]);
    } 

Are you suggesting to add that whole block of code? or to modify an existing block somewhere?

Yes - add this block to includes/modules/payment/linkpoint_api.php in place of the existing l. 393-395. Lline numbers from the patch file in
http://www.zen-cart.com/forum/showthread.php?p=563490#post563490

    if ($credits_applied_so_skip_subtotal) {
      unset($myorder["subtotal"]);
    }

To duplicate this problem, use enough GV to cover your products so the shipping cost is greater than the total. This will trigger it.

k - that should work fine for 138.

v1.3.9 and newer will be using a different method of preparing subtotal data, which avoids the need to re-do the math as you've done.