Drip / COD

Greeting,

I hope you can help me.
For the purposes of our campaign, I should integrate our sales form within the site, but in order to satisfy these conditions

1)
Is there a possibility to send to our clients via your plugin parts of drip subscription, but that the payment method should not be over paypal or credit card but through COD (cash on delivery).
Clients should activate theire supscriptions with some kind od activation link or through coupon with activation code.
Our optimisations tests have shown that we have much better results with this payment method.

2)
Is ti possible to send FREE drip shipping product through your plugin?
For example, we send the client a e-book divided into 10 chapters completely free of charge, and the next we charge.

Thank you for your time and effort.