Magento - Multiple coupons at single purchase checkout

I'm trying to implement a multiple coupon function at checkout for a single purchase.

In fact I need to allow at most 2: At most 1 "promotion" At most 1 of "affiliate"

Type, influencer10 = 10% off the product seller1 = 5% off the product

And would make use of the coupons to make internal transfers.

I'm using Magento 1.9.3.2 Checkout Extension: OSC Oglenax

I've tried these 2 modes but I could not get a good result: 1) link

2) link