Free Credit
No. Free Credit resets at the end of every billing cycle. Unused Free Credit does not roll over.
Main Credit from your subscription
No. Main Credits included with your subscription expire at the end of each billing cycle and do not roll over.
Main Credit from top-ups
Yes. Main Credits purchased through a top-up have a 1-year expiry from the date of purchase, they carry over month to month until they expire.
Note: Credits are consumed in order of earliest expiry first. Your subscription credits are always used before your top-up credits.