I would like to create a skript that processes a purchase, I have reached a point but I would like to add a number to the transition code (ID), which increases every time the command is executed

Code (Text):

1. command /kalskmx:
2.     trigger:
3.         if balance of player is greater than 699:      
4.             give 10 eggs named "&bBullets" to player
5.             send ""
6.             send "&9&lPurchase successful!"
7.             send ""
8.             wait 1 second
9.             send "&7Items: &9Bullets"
10.             send "&7Quantity: &910"
11.             send "&7Cost: &9700€"
12.             set {_IDcode} to "4653: "
13.             add 1 to {IDcode}              
14.             send "&7Purchase ID: {IDcode}"
15.             make console execute command "eco take %executor% 700"          
16.             send ""
17.         else:
18.             send "&cYou don't have enough money to complete the transition!"      
19.         stop