diferenciating between picking up and buying items

[Red_drake]

edit: i wish i could spell

i have this trigger that i got from hiveworkshop and its for an item limit system, but my problem is that it doesnt refund money if you buy the item. i wanna know if someone could help me with it, tell me how i could refund the hero if they buy it, but cant use it.

function Add_Group_Limits takes integer num returns nothing
    local item It = GetManipulatedItem()
    local unit u = GetTriggerUnit()
    local integer ut = GetUnitTypeId(u)
    local integer it = GetItemTypeId(It)
    local string grp = GetStoredString(GameCache(),"ItemStoreGroup"+I2S(it),"AddGroupGet"+I2S(num))
    local integer i = 0
    local integer limit = 0
    local integer ulimit = GetStoredInteger(GameCache(),"UnitID"+I2S(ut),"GroupName"+grp)
    if It == null then
     set u = null
     return
    endif
    if ulimit == 0 then
     call UnitRemoveItem(u,It)
     if grp == null then
        call DisplayTextToPlayer(GetOwningPlayer(u), 0, 0, "|cFF00FFFFYou can't have items of this type")
     else
        call DisplayTextToPlayer(GetOwningPlayer(u), 0, 0, "|cFF00FFFFYou can't have items of type "+grp)
     endif
     set It = null
     set u = null
     return
    endif
    loop
    exitwhen i > 5
     if GetStoredBoolean(GameCache(),"ItemStoreGroup"+I2S(GetItemTypeId(UnitItemInSlot(u,i))),"GroupName"+grp) == true and UnitItemInSlot(u,i) != It then
      set limit = limit + 1
     endif
     set i = i + 1
    endloop
    if limit >= ulimit then
     call UnitRemoveItem(u,It)
     if ulimit == 1 then
      call DisplayTextToPlayer(GetOwningPlayer(u), 0, 0, "|cFF00FFFFYou can't have more than "+I2S(ulimit)+" item of type "+grp)
     else
      call DisplayTextToPlayer(GetOwningPlayer(u), 0, 0, "|cFF00FFFFYou can't have more than "+I2S(ulimit)+" items of type "+grp)
     endif
    else
    if GetStoredString(GameCache(),"ItemStoreGroup"+I2S(it),"AddGroupGet"+I2S(num+1)) != null then
    call Add_Group_Limits(num+1)
    endif
    endif
    set It = null
    set u = null
endfunction
    
    
function Check_Group_Limits takes nothing returns nothing
    local item It = GetManipulatedItem()
    local unit u = GetTriggerUnit()
    local integer ut = GetUnitTypeId(u)
    local integer it = GetItemTypeId(It)
    local string grp = GetStoredString(GameCache(),"ItemStoreGroup"+I2S(it),"GroupGet")
    local integer i = 0
    local integer limit = 0
    local integer ulimit = GetStoredInteger(GameCache(),"UnitID"+I2S(ut),"GroupName"+grp)
    if It == null then
     set u = null
     return
    endif
    if ulimit == 0 and (grp != null) then
     call UnitRemoveItem(u,It)
     //if grp == null then
        //call DisplayTextToPlayer(GetOwningPlayer(u), 0, 0, "|cFF00FFFFYou can't have items of this type")
     //else
     //   call DisplayTextToPlayer(GetOwningPlayer(u), 0, 0, "|cFF00FFFFYou can't have items of type "+grp)
    // endif
     set It = null
     set u = null
     return
    endif
    loop
    exitwhen i > 5
     if GetStoredBoolean(GameCache(),"ItemStoreGroup"+I2S(GetItemTypeId(UnitItemInSlot(u,i))),"GroupName"+grp) == true and UnitItemInSlot(u,i) != It then
      set limit = limit + 1
     endif
     set i = i + 1
    endloop
    if limit >= ulimit and (grp != null) then
     call UnitRemoveItem(u,It)
     if ulimit == 1 then
      call DisplayTextToPlayer(GetOwningPlayer(u), 0, 0, "|cFF00FFFFYou can't have more than "+I2S(ulimit)+" item of type "+grp)
     else
      call DisplayTextToPlayer(GetOwningPlayer(u), 0, 0, "|cFF00FFFFYou can't have more than "+I2S(ulimit)+" items of type "+grp)
     endif
    else
    if GetStoredString(GameCache(),"ItemStoreGroup"+I2S(it),"AddGroupGet"+I2S(1)) != null then
    call Add_Group_Limits(1)
    endif
    endif
    set It = null
    set u = null
endfunction

function Check_Dummy takes nothing returns boolean
    return (GetUnitTypeId(GetTriggerUnit()) != 'h000')
endfunction
//===========================================================================
function InitTrig_ItemCheckGroupLimits takes nothing returns nothing
    set gg_trg_ItemCheckGroupLimits = CreateTrigger(  )
    call TriggerRegisterAnyUnitEventBJ(gg_trg_ItemCheckGroupLimits,EVENT_PLAYER_UNIT_PICKUP_ITEM)
    call TriggerAddCondition( gg_trg_ItemCheckGroupLimits, Condition(function Check_Dummy))
    call TriggerAddAction( gg_trg_ItemCheckGroupLimits, function Check_Group_Limits )
endfunction