In one line
Units you spend on certain actions on Influcius. They are not money.
A search beyond your allowance costs 2 credits, and starting a conversation with someone new costs 1 (nothing with Pro). Bought credits last 12 months, earned credits 90 days and welcome credits 30 days.
Credits cannot be cashed or moved to someone else.
Agree: nothing: what each action costs is shown before you spend.