How to convert google form into a product for yearly subscription base in pabbly subscription ?

Hi, Warm greetings from PINTU.
I need your assistance.

My question is.
I have created a workflow by using pabbly,
Google form used as a trigger and WhatsApp Cloud API is used as Action.

Now it is my workflow. And i want to make my workflow a product and by using pabbly billing I want to sell my this workflow.

Now i am faceing problem like
If i sold my above work flow to many user through pabbly subscription and and 3 users didn't renew his/ her subscription.
How system automatically stop the workflow only for those who has not renewed subscription.
& Those who renewed his subscription on or before time system let thier workflow continue.

I don't know weather my question is right or wrong.
Thank you