unable to find which item sold

Hi,

How can I know which product just sold ?
For example: Same question here, now let’s say I am selling 3 packages, package one ID 1, 2nd with ID 2 and third with ID of 3. Now, how can I know which package user purchased ?

Its really needed as I will update user data base based on his/her purchased package. Like user purchased package 1 so I will update details to his/her database only from package one.

I hope I was able to make it understandable. Any help needed please ?

Thanks