I want stacking of our bulk Discounty discounts with Shopify coupon codes

I want customers to be able to apply our Discounty bulk product discounts and also enter a Shopify coupon code (e.g., HATSOFF15) at checkout so both discounts stack together. Currently Shopify prevents two product discounts from stacking and Discounty cannot create or combine external Shopify coupon codes—please add support to create/manage coupon codes and/or provide a server-side stacking solution that works with Shopify's checkout.