How do you track your items conversions ?

Hello everyone,

We have an item on CodeCanyon and we are trying to make more sales using and creating campaigns and external traffic redirected to the item page on CodeCanyon.

We hired a marketing strategy guy and he said that he needs at least one of the following:
1.conversion traffic ability
2.sub_id tracking
3.pixel code on the checkout page
4.affiliate tracking

So, i created a ticket to envato asking for help about this requirements, and they told me they can NOT help me at all with this and that i should ask you guys on the forum because you might help, so please did anybody here manage to track conversions for external traffic somehow?

Thank you!

Really? Nobody did external traffic campaigns ?

Please we need some feedback how you tracked the conversions.

Thank you!