We have a problem here.
Condition: We have created a package that can publish only one item.
Issue: When the user buys a package and publishes the ad and then buys an additional package to post the additional item, the system charges normally, but the user cannot publish the additional item purchased with the second package.
Solution: We need an option that can buy single ad, with privilege to limit purchase for certain Listing Types.
This is possible if there is an option when creating the package and setting whether it is a package or a single ad.