I sell information products. How to make a discount to a friend in social networks who recommended the product?

Question

PHP

Let me know if anyone has done this before.
I am selling an information product, and before paying, I want to offer to place a record about the product in social networks (one of them) with the provision of a discount on the product after that.
The question is actually this. In VK, let's say you can track the successful addition of an entry to the wall via js-api?
Thank you.

Answer 1

You can check for an entry via https://vk.com/dev/wall.get