Minecraft 1.16+ Shop Tutorial Commands from TheTerrain

*In CHAT*:
/scoreboard objectives add Points dummy
/give @a minecraft:command_block

*Successful Purchase:
/execute as @p[scores={Points=5..}] run give @s minecraft:pufferfish 1
/execute as @p[scores={Points=5..}] run tellraw @s {"text":"You have purchased this item!","color":"green"}
/execute as @p[scores={Points=5..}] at @s run playsound minecraft:block.note_block.pling ambient @s ~ ~ ~ 5 2
/scoreboard players remove @p[scores={Points=5..}] Points 5

*Not successful purchase:
/execute as @p[scores={Points=..4}] run tellraw @s {"text":"You do not have enough Points to purchase this item!","color":"red"}
/execute as @p[scores={Points=..4}] at @s run playsound minecraft:block.note_block.pling ambient @s ~ ~ ~ 5 0