This plugin is very useful for OpenCart installations that deal with many vouchers. In addition to adding filtering capabilities, it also adds a column to display the balance left on a given voucher and also keeps track of who was emailed the vouchers.

So in summary:

• Adds filtering capabilities to the default OpenCart admin voucher section
  
• Keeps track of whether or not the voucher was emailed to the customer
  
• Displays the balance left for each voucher.
  

This plugin is based on vQmod and currently supports the following OpenCart versions:

• 2.1.0.2