shops command for video

First Make A Scoreboard Objective
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/scoreboard objectives add DETECT dummy
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Command For Villager Just Change Rotation Tag As You Want.

/summon Villager ~ ~1 ~ {CustomName:"Merchant",CustomNameVisible:1,Profession:3,Career:0,Invulnerable:1,Rotation:[270f,0f],PersistenceRequired:1,CanPickUpLoot:1b,NoAI:1}

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Put This On Repeating Command Block

/scoreboard players set @e[type=Item] DETECT 1 {OnGround:1b,Item:{id:"minecraft:gold_block"}}

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Put This On Other Repeating Command Block

/execute @e[type=Villager,name=Merchant] ~ ~ ~ /execute @e[score_DETECT_min=1,score_DETECT=1,r=2] ~ ~ ~ /give @p diamond_sword

Now Put This With Chain Command Block

/execute @e[type=Villager,name=Merchant] ~ ~ ~ /kill @e[score_DETECT_min=1,score_DETECT=1,r=2]

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