OpenCart Auto Store Credit by Order Totals extension, it allows you to add a store credit in rates you set automatically according of your customers order subtotal or totals. Thus, by rewarding your customer, you increase the possibility of ordering again. The added store credit will be automatically deducted in next order of the customer.
Module Features

• Calculation based on subtotal or total basket.
  
• Credit alert message to be earned on product, shopping cart and checkout page.
  
• The alert message can be customized in the module settings.
  
• Add multiple discount values. You can add credits with different values depending on the order total by adding multiple discounts.
  
• Customer groups support. Support multiple selection.
  
• Percentage and fixed discount types support.
  
• Complete Order Status support.
  
• In order for the credit to be earned, one of the order complete status must be assigned.
  
• If the order is assigned to cancellation, refund etc. status the added credit will be automatically deleted.
  
• No core files overwritten.