v2.3.2

Added backend form to add / edit / delete accepted promo codes.

Important note

Once you add new codes here, they will only work for products if the product’s google_promo_code attribute option text matches the code saved in this table.

So the flow is now:

add code in admin grid, e.g. SPRING10
set product google_promo_code option to SPRING10
assign a matching Magento sales rule coupon SPRING10
your extension will allow and process it