Access limited to a digital subscription in PS 1.7

[Kimodo]

Hi everyone,  we are looking for a bit of user wisdom in the forum, 

We are trying to develop a subscription access to a marketplace in our store but don’t know exactly how to approach to this. 

1. We are implementing this module to get a marketplace in our store: https://addons.prestashop.com/es/creacion-marketplace/32443-marketplace-builder-multivendedor.html
2. The idea is to sell a digital subscription to clients to allow them to access to this service and let them to post their products.
3. Our first thoughts were to create the subscription as a digital product as a first step to acces.
4. The key issue is that we aren’t sure about how to automatically set this if condition: “if customer “A” has bought product “B” (digital subscription), then customer “A” has access to upload products to the store. 

Have you got any ideas about how can we raise this question?

Thanks in advance.