I have some developer determined win-back offers as part of a subscription I plan to make available for lapsed subscribers but I don’t think defold has a way referring to a specific offer when making a call to iap.buy().
Perhaps an additional member of the options table along with the subscription token to specify the particular offer that as a developer I want to give.
Also, maybe offers for a subscription are returned as part of the subscription.pricing table in the callback for a call to iap.list()