Is it possible to add a customer to a product, if he subscribes to my list?
The best way to do this with ProductDyno is to add your lead magnet as a FREE product. Then when a prospect signs up for the lead magnet, he will be added as a member and added to the integrated autoresponder account.
TIP: Include your FREE product in a Collection of (paid) Products. Then when your prospect has signed up - he will get access to the free produce and see all the other products in the collection - it might entice him to buy!