The subscription gem as well has inherent problems that we stumbled on during human testing: • solidus returns invalid payment methods upon checkout while not creating a recurring subscription • The validation if a product with variants is subscribable does not occur resulting in two problems: subscribable variants can not be subscribed to if the parent product is not subscribable and a not subscribable variant results as subscribable if the parent is suscribable I am aware that the changes require a heavy modification to the core of the gem that might in all honesty be breaking changes. I would suggest that we take the same road as with the review gem.