Overrides how the expiration information is shown on the levels and checkout pages. Again don’t abuse this by showing a different expiration than is real. Be careful if you change your expiration settings to update your filter if needed. The hook passes the text generated by the
pmpro_getLevelExpiration($level) function and also a level object which is prepopulated with levels pricing and expiration settings already adjusted for any discount codes that may be in affect.
apply_filters("pmpro_level_expiration_text", string $expiration_text, object $levels);