Billmate

Every payment module from Billmate should be modified.

1. Open Billmate payment module files:

   app/code/community/Billmate/Bankpay/Model/Billmatebankpay.php
   app/code/community/Billmate/BillmateInvoice/Model/Billmateinvoice.php
   app/code/community/Billmate/Cardpay/Model/Billmatecardpay.php
   app/code/community/Billmate/PartPayment/Model/Partpayment.php
   

2. Find the following lines in each of the file:

   $data = $quote->getTotals();
   $total = $data['subtotal']->getValue();
   

3. Replace them with:

   // $data = $quote->getTotals();
   // $total = $data['subtotal']->getValue();
   $total = $quote->getSubtotal();
   

4. Save the files and clear the cache.