Hi Augustin, thanks for reaching out. 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. So if you're on a free account, the upper limit will be 200 credits, of which 100 will roll over as the rest of the credits renew. If you buy an annual plan, you get all your credits upfront, and you can use them however and whenever you’d like.
You can read more about the Credit Roll Over Update here. Let me know if you have additional questions!
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