When sending InMail messages with follow-ups, each message, whether initial or follow-up, is treated individually, and credits are charged upfront at the time of scheduling.
If the candidate responds to the initial message, the follow-up message is automatically canceled, and both credits are refunded. This happens because credits are refunded whenever a candidate responds to a message and the follow-up message was not sent.
If the candidate does not respond to the initial message and the follow-up is sent, a recruiter will receive a refund for one credit only if the candidate replies to either message. However, no refunds are provided for follow-up messages that are sent and do not result in a response.
Any credits that are refunded will be returned to the dashboard rather than the individual user account.
Note: Follow-up messages aren't available in Recruiter Lite.