Database Schema design for mongodb

so basically I am creating a project similar to shopify. I have users and each user can have one or more stores. There is a limited number of stores a user can have. For each store I assign a subdomain to my main domain, so I retrieve data using that subdomain that is basically the id of the store. So my question is: Should I create 2 collections (stores and users) and build a relationship between them. or Should I put a stores (array of objects) inside the each user document.

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