This filters how many days before expiration PMPro should send expiration warning emails. The default is 7 days.
pmpro_send_expiration_warning_email
Controls whether or not to send membership level expiration warning emails. Passes the boolean true or false and the user ID.
pmpro_send_expiration_email
Controls whether or not to send membership level expiration emails. Passes the boolean true or false and the user ID.
pmpro_send_trial_ending_email
Controls whether or not to send membership level trial ending emails. Passes the boolean true or false and the user ID.