For pre-paid credits, you can use them for both live sessions and freelance jobs.
For free/promotional, they can only be used for live sessions.
Note: To start a session, you will need at least 20 minutes worth of credits based on the mentor's rate. If your remaining credits are not enough to pay for a session, you will be charged the remaining cost via your credit card. If you do not have a credit card associated with your Codementor account, your session will be automatically paused until you purchase additional credits.