Hi Qamar, thanks for reaching out. That's right, credits do roll over based on a specific set of rules: if you have a monthly subscription, unused credits will roll over and accumulate in your account up to 2x the credit limit according to your plan. If you buy an annual plan, you get all your credits upfront, and you can use them however and whenever youโd like.
You can read more about the Credit Roll Over Update here. Let me know if you have additional questions!