How to analyze lead sources when advertising goes through the market platform?

Question

Marketing

I advertise in various VK groups on the market platform (in 5-10 communities in parallel).
How to understand from which group leads/sales come?
To analyze the effectiveness of advertising.
The collection of leads and sales occurs only in the VK group.
In addition to different promotional codes in different groups, I haven’t come up with anything yet.
Share your experience, how do you analyze such indicators?

Answer 1

put utm tags on links and use a unique link in each group.
cut through https://vk.com/cc