zero dollar checkout problem caused by store credit mod

I am having an issue with payment modules.

Zencart:1.3.9

The problem is that when a customer enters a coupon/store credit which covers 100% of the total ($0 subtotal), Paypal is selected as payment method and leads to order total errors.

However, once the error returns the customer to Step2 and the customer proceeds, freecharger is selected this time and order is processed without any issues....

Any ideas on how to fix this issue.

The problem is that when a customer enters a coupon/store credit which covers 100% of the total ($0 subtotal)

Any ideas on how to fix this issue.

I would adjust the coupon minimum order amount to be more than the value of the coupon

yes. that would be a fix but the reason for this transaction is to enter paid orders in the system.

these have been paid by phone, however its being processed for record only. using coupons/store credits and by admin.

Otherwise, everything is fine.

It seems that Zencart has a bug in processing Zero total orders, so I came with a work around for now..

In the checkout page I ask the customer to go to previous page for verification and the 2nd run solved the issue. [I was having this issue with Paypal]

	$customtotal= $order->info['total'];		
       $paypalyes = $GLOBALS[$class]->title;

if ($customtotal <=0 && $paypalyes=='PayPal') {
	echo 'Detected discount. <a href="/index.php?main_page=checkout_shipping">Click here  to Verify and proceed</a>.';
} 

and to deal with submit button:

<? if ($customtotal <=0 && $paypalyes=='PayPal') { } else { ?>
<?php echo zen_image_submit(BUTTON_IMAGE_CONFIRM_ORDER, BUTTON_CONFIRM_ORDER_ALT, 'name="btn_submit" id="btn_submit"') ;?></div>
<? } ?>

I hope this issue is solved by Zerncart team soon.

that would be a fix but the reason for this transaction is to enter paid orders in the system

these have been paid by phone
That is not what you posted first!!!!
Paypal is selected as payment method and leads to order total errors.

In the Admin->Customers->Orders screen, where you see the list of orders placed, the 2nd column shows 2 lines: the payment module and the shipping module used in the order. What's listed there for those orders that you allege are being paid via PayPal for $0.00 ?

the payment shipping shows as "paypalwpp
zones".

I will give a historyof this issue:

When freecharger module was disabled, It was impossible to checkout using 100% store credit. And since the only other payment method available is Paypal, all orders, including $0 totals were sent to Paypal.

At this popint it output error 10401. I'm assuming Paypal doesnt like $0 total and payment shouldn't be sent there anyways for $0.

10401 Transaction refused because of an invalid argument...

After searching the forum, I found a thread that suggested enabling the 'freecharger' module to process Zero total and I did that.

Now, when the store credit covers 100% of the cost, Order total is calculated using store credit but method of payment stays as Paypal and submitted to Paypal page.

The issue is solved if the customer goes back to any of the previous pages in checkout process and proceeds from there. [maybe, its changed in sessions???]

What I find surprising is that the Invoice after the purchase shows 'papal' as the payment method.

Is there any more history you've left out? Any other things you've turned off or turned on that probably shouldn't be?

Nothing that is related to payments. I figured it could be a $_sessions problem.
third party module (sore credit) maybe creating a conflict with zencart sessions variables.

The tweak I suggested earlier fixes the issue, by creating one extra click.

On a brand new clean uncustomized install without any addons, I can't seem to replicate the "bug" you claim exists.
What exact steps should I be following to recreate the problem, using a brand new clean uncustomized install of Zen Cart?

Yes, It seems that error is being created by the addons. in this case, its the store credit mod with combination of other mods.

I tested a clean install of Zencart and this error didnt exist in the test run.

DrByte:

On a brand new clean uncustomized install without any addons, I can't seem to replicate the "bug" you claim exists.
What exact steps should I be following to recreate the problem, using a brand new clean uncustomized install of Zen Cart?

v1.3.9.g
When I have a coupon of any percent discount, the amount of the order transfers to Paypal as zero. When I remove the coupon options, the amount transfers correctly to Paypal. Any Ideas.