command /redeem [<number>]:
trigger:
give player [heart material] named "name" with lore "1st line lore" , "2nd line lore"
if player's max health is greater than {minimumHealth}:
set player's max health to player's max health - 1
send "[Name Here] You just redeemed &41 heart&8!" to player
Brackets aren't needed but recommended for the send part.
your welcome
DO NOT EDIT command /redeem [<number>]