How to add bonuses through your affiliate link?

So I've been reading this forum for a while and I saw a guy in the Journey section mention this. My question is?
How do you add bonuses through your affiliate link?
I don't own the product, but if I promote a software I could make a more detailed guide or add an PDF with some strategies on how to use it.
Example
File 1 (the product that someone made)
File 2 (a short guide or something I made)
I don't know the guy who made it.
Now I say, "If you buy it here you'll get a bonus guide" or stuff like that. Meaning, if he buys through my affiliate link he'll get extra stuff for free.
Is there a plugin for this?
Has anyone done that?

This is typically accomplished by requesting that users who purchase the product through your affiliate link submit proof of purchase to you via email. You would then award them with the bonuses you've promised. In order for you to automate a process like this, it would require cooperation from the vendor.

EDIT: Technically you could automate this process entirely on your own, but you would need to have access to sufficient details via your affiliate dashboard.

I know that if you promote jvzoo products you can attach bonuses inside the jvzoo members area. Then set up your bonus page or somewhere to tell visitors about your bonus and when they buy they can access your bonuses where they access the actual product.

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