Payfast -- Use of gift certificate generates error after payment successful

[bruce]

Zencart 1.3.9h, not upgraded

I have set up my Zencart and I am busy testing before going live.

I set up my store to issue a gift certificate when a new customer registers on the site. When I used that gift certificate, it all worked fine until after payment had been made.

After payment I was redirected back to my store, but instead of getting to "Checkout Success", I am get to "Step 2 of 3 - Payment Information" and there is a red message displayed saying "It appears that the amount you have tried to apply and your Gift Certificate balance do not match. Please try again." This is after the Gift Certificate has been used and payment has been collected for the purchase amount less the amount applied from the gift certificate balance.

To the customer, it looks as if the purchase has been unsuccessful and the shopping cart still contains the items that were purchased. However, Zencart has generated the order.

Obviously this is a problem because the customer knows that payment has been collected already, but the purchase appears unsuccessful. Most customers will not first check if their orders are listed under "My Account" to see if an order has been generated. Is there a setting I need to change to allow customers to use their gift certificates?

Many thanks for your assistance.

[Kim]

What Addons have you installed? What payment methods do you have active?

[bruce]

I have installed one add-on to add an extra payment method called Payfast. Payfast is a payment gateway. I initially had a problem with the shopping cart in that an order was not generated despite checkout success. The Payfast technical support team checked out my installation and corrected the error.

The Payfast payment gateway works fine. However, if a gift certificate is used, the order is generated, but the customer is returned to the Payment Information page with the error message. It seems that when the gift certificate is used, the gift certificate amount on the Payment Information page is not cleared. The customer's balance is zero since the gift certificate was used with the order, but the website seems to think the customer is trying to use the gift certificate again. Not sure if the explanation is very clear.

I can give you details of the site and set the payment gateway to test mode so you can check it out if that would be helpful?

[DrByte]

After payment I was redirected back to my store, but instead of getting to "Checkout Success", I am get to "Step 2 of 3 - Payment Information" and there is a red message displayed saying "It appears that the amount you have tried to apply and your Gift Certificate balance do not match. Please try again." This is after the Gift Certificate has been used and payment has been collected for the purchase amount less the amount applied from the gift certificate balance.

That's not normal, and certainly not how the software was written.

Sounds like a problem in your payment module or code customizations or addons.

Additionally, I can't replicate that activity using a fresh clean uncustomized install using built-in payment modules and demo products.

Try turning on the Check/MoneyOrder payment module, and do a checkout with that, using Gift Cert as part of the payment.
How does the experience differ?

[bruce]

Thanks, Dr Byte.

Using the Check/Money Order module does work correctly and CheckOut_Success is confirmed.

What I can't work out with the Payfast module is that somehow the pre_confirmation_check($order_total) function is being invoked before the checkout_success page is reached. It seems that maybe the session variables are not being properly cleared, but I have gone through the Payfast.php module and immediately before the zen_redirect to checkout_success command, the $order_total_modules->clear_posts() command is given. I have also compared the code in the before_process function per the payfast.php module to the code per the paypal.php module and they are identical.

They both call $order_total_modules->clear_posts(); and then zen_redirect( zen_href_link( FILENAME_CHECKOUT_SUCCESS, '', 'SSL' ) );

Is there any way of debugging this in a step through fashion and keeping track of the environment variables while doing so?

[bruce]

This must be a Payfast specific issue - I tested using the Paypal Express Checkout and it works correctly.

I am a little bit stuck now.

[PayFast]

We have stepped through our code, and for some reason the before_process function in our module is not being called by Zen-Cart. Our module works fine on our test systems, but not on Bruce's.

Can anyone point out as to why this would happen? As Bruce points out, our before_process is practically identical to PayPal's. Doing a search on this forum shows many payment modules seem to be effected as of late, but we've yet to find a solution.

[Zelda]

Hello

Please can you tell me how you installed the Payfast module. As when i go to Zencarts payment module to install, Payfast is not there as an option in Zencart 1.5?

I have installed one add-on to add an extra payment method called Payfast. Payfast is a payment gateway. I initially had a problem with the shopping cart in that an order was not generated despite checkout success. The Payfast technical support team checked out my installation and corrected the error.

The Payfast payment gateway works fine. However, if a gift certificate is used, the order is generated, but the customer is returned to the Payment Information page with the error message. It seems that when the gift certificate is used, the gift certificate amount on the Payment Information page is not cleared. The customer's balance is zero since the gift certificate was used with the order, but the website seems to think the customer is trying to use the gift certificate again. Not sure if the explanation is very clear.

I can give you details of the site and set the payment gateway to test mode so you can check it out if that would be helpful?