Allowing a customer to complete checkout process with zero total order.

[sonjamichelle]

I've run into an issue when using gift certificate, coupons, store credit, reward points and any combination thereof when I customer has applied these gimmicks to their order resulting in a $0.00 amount. The customer can no longer complete the checkout process because the payment options will not allow a $0.00 order. The freecharger module will not work because the base item is not free. The order total is the result of using the above gimmicks to get a free item.

I would like to add a payment option in the list for a zero amount order so the customer can complete the order process.

The only solution I've come up with so far is instructing the customer to choose check or money order.

[Ajeh]

Just for giggles and grins ... can you add this fix to your code ...
http://www.zen-cart.com/forum/showth...333#post705333

[sonjamichelle]

Ok, I made that change, but I don't see where it had any bearing on my issue.

Everything is working as it should. I just don't have an option available for someone who has a zero total order.

My payment options are check/money order, paypal express, and paypal IPN. If I use check/money order I can check out and the order gets sent to the queue for processing. Of course if I choose paypal, paypal rejects it because it's a zero total. If I don't choose anything I get the "payment method not selected error".

Soooo, I either need to replicate the check/money order module and rename/re-function it to process the zero amount. Or I need to add an update button to the order total page that will take into account the gift certs, coupons, store credit, reward points, etc so that the freecharger module can come into play.

[DrByte]

This is a totally experimental thought ...

Try editing /includes/classes/payment.php. Around line 40 you'll see this:

        if (zen_get_configuration_key_value('MODULE_PAYMENT_FREECHARGER_STATUS') and ($_SESSION['cart']->show_total()==0 and $_SESSION['shipping']['cost']== 0)) {

Change it to:

        global $order;
        if (zen_get_configuration_key_value('MODULE_PAYMENT_FREECHARGER_STATUS') and (($_SESSION['cart']->show_total()==0 || ($order->info['currency'] != '' && $order->info['total'] == 0)) and $_SESSION['shipping']['cost']== 0)) {

[sonjamichelle]

That edit resulted in the payment page rendering blank.

Lines 39-58 in my file:

       // Free Payment Only shows
        if (zen_get_configuration_key_value('MODULE_PAYMENT_FREECHARGER_STATUS') and ($_SESSION['cart']->show_total()==0 and $_SESSION['shipping']['cost']== 0)) {
//global $order;
//        if (zen_get_configuration_key_value('MODULE_PAYMENT_FREECHARGER_STATUS') and (($_SESSION['cart']->show_total()==0 || ($order->info['currency'] != '' && $order->info['total'] == 0) and $_SESSION['shipping']['cost']== 0)) { 
          $this->selected_module = $module;
          if (file_exists(DIR_FS_CATALOG . DIR_WS_MODULES . '/payment/' . 'freecharger.php')) {
            $include_modules[] = array('class'=> 'freecharger', 'file' => 'freecharger.php');
          }
        } else {
          // All Other Payment Modules show
          while (list(, $value) = each($this->modules)) {
            // double check that the module really exists before adding to the array
            if (file_exists(DIR_FS_CATALOG . DIR_WS_MODULES . '/payment/' . $value)) {
              $class = substr($value, 0, strrpos($value, '.'));
              // Don't show Free Payment Module
              if ($class !='freecharger') {
                $include_modules[] = array('class' => $class, 'file' => $value);
              }
            }
          }

You can see where I commented out the edit that rendered the page blank.

[wilt]

Hi,

Generally when using stock code and modules Zen Cart has no problems handling orders with zero value, even if you are using Paypal.

There is logic to test the order total and skip even going to paypal if it is.

I therefore suspect an incompatibility with some of the extra contributions you are using.

That said, something similar has been noted before regarding contributed order total modules, and a fix was provided.

The fix relates to the includes/classes/order_total.php file.

You will need to replace this block of code

  function pre_confirmation_check() {
    global $order, $credit_covers;
    if (MODULE_ORDER_TOTAL_INSTALLED) {
      $total_deductions  = 0;
      reset($this->modules);
      while (list(, $value) = each($this->modules)) {
        $class = substr($value, 0, strrpos($value, '.'));
        if ( $GLOBALS[$class]->credit_class ) {
          $order_total = $GLOBALS[$class]->get_order_total();
          if (is_array($order_total)) $order_total = $order_total['total'];
          $total_deductions = $total_deductions + $GLOBALS[$class]->pre_confirmation_check($order_total);
        }
      }
      $difference = $order->info['total'] - $total_deductions;
      if ( $difference <= 0.009 ) {
        $credit_covers = true;
      }
    }
  }

with

  function pre_confirmation_check() {
    global $order, $credit_covers;
    if (MODULE_ORDER_TOTAL_INSTALLED) {
      $total_deductions  = 0;
      reset($this->modules);
      $orderInfoSaved = $order->info;
      while (list(, $value) = each($this->modules)) {
        $class = substr($value, 0, strrpos($value, '.'));
        if ( $GLOBALS[$class]->credit_class ) {
          $order_total = $GLOBALS[$class]->get_order_total();
          if (is_array($order_total)) $order_total = $order_total['total'];
          $total_deductions = $total_deductions + $GLOBALS[$class]->pre_confirmation_check($order_total);
        }
        else 
        {
          $GLOBALS[$class]->process();
          $GLOBALS[$class]->output = array();
        }
      }
      $difference = $order->info['total'] - $total_deductions;
      if ( $difference <= 0.009 ) {
        $credit_covers = true;
      }
      $order->info = $orderInfoSaved;
    }
  }

As with any code change, always make sure you backup any files being changed first.

[DrByte]

That edit resulted in the payment page rendering blank.

Ya, that's why I edited the post earlier to include the missing parenthesis.



I recommend exploring wilt's input though.

[3.14]

I have experienced the inability to accept payment from any zone when processing a cart with $0.00 total value.

My particular store is set up using a shipping module called - Static Shipping -

The payment module is an add-on called - Offsite Payment -

All other shipping and payment modules are defeated.

When arriving at the checkout......

A dialog comes up saying that "Sorry, we are not accepting payments from your region at this time" (Also seen at the thread http://www.zen-cart.com/forum/showth...pting+payments )

Further, the confirmation email then insists on showing Gift Voucher/Coupon as the payment method.

This payment method is consequently displayed when viewing any previous orders.

My solution! ( ...based on only the two shipping and payment modules mentioned)

............in the file includes/classes/payment.php

I commented out the following section of code.

if (zen_get_configuration_key_value('MODULE_PAYMENT_FREECHARGER_STATUS') and ($_SESSION['cart']->show_total()==0 and $_SESSION['shipping']['cost']== 0)) {
$this->selected_module = $module;
if (file_exists(DIR_FS_CATALOG . DIR_WS_MODULES . '/payment/' . 'freecharger.php')) {
$include_modules[] = array('class'=> 'freecharger', 'file' => 'freecharger.php');
}
} else

Now this is done I am able to run $0.00 sales with the correct payment method.

The code I commented out was preceeded by an existing comment which says ...

// Free Payment Only shows

I guess I may have achieved what I want but it could break the use of the freecharger module shown in the defeated code.

[DrByte]

Normal behavior is that the freecharger module must be enabled if you ever want to checkout when the balance is 0.00.
So, simply undoing the changes you mention, and enabling the freecharger module should suffice.

[3.14]

Thankyou Dr Byte,

I've done as you said.