gain credits for each purchased to be used in the future

I have a subscription product that after payment want to credits in points or another kind of credit to the customer so he can use those credits to exchange for other item that i have in my website.

how can i achieve that?

for example customer buy item at 10/mo and after 10 months this customer will have 100 on credit that he can use to purchase another item that cost 100

Hello,
Greetings

To gain a clearer and better understanding of the problem and take appropriate measures to resolve it. We kindly request that you to schedule a call to demonstrate the issues you are encountering.

You can schedule another call with our team at your convenience. Please use the link below to select a time and date that works best for you.
https://calendly.com/pabblyteam/pabblysubscriptionbilling?month=2023-04

Thanks & Regards,
Mukesh,