Integrating with dokan multivendor

Hi, I am creating a multivendor site with dokan. The cashback functionality works fine until I realised who pays for the cashback credit. It looks like the cashback is currently coming out of vendors’ pockets which I would like to change. Can the cashback be somehow compensated by website owener and not the vendors who use the website.

Example situation.
Customer buys $100 dollars worth of goods from Vendor ABC and earns cashback of $10. Now the customer has $10 in the wallet. Next he goes to Vendor XYZ and buys $10 dollars of shopping. The customer will settle the bill with the cashback credit earned from first transaction with Vendor ABC. But according to current setup, Vendor XYZ will not receive any amount in payment as the customer had payed for the shopping using cashback credit. Now this setup isn’t fair as owner of website, I wanted the cashback amount to come out of my pocket and not from Vendor XYZ.

Can you please help? Thank you