In my wp_usermeta table I have a field called "wp_s2member_custom_fields"
In it is stored this value:
a:2:{s:6:"alumni";s:3:"Yes";s:19:"donations_collected";s:2:"10";}
I am trying to use:
update_user_meta( $team_member_id, wp_s2member_custom_fields, $meta_value)
To update "donations_collected" from 10 to 11.
What should I put in $meta_value?