While browsing for products on JuniperMarket some brands might require you to request access and be approved before being able to purchase their products.  

from product details

Click on a product tile from a category or search results to view its product details page. Click on the green "request access" icon to the right of the product image to request access to buy from the brand.  If sold by multiple brands, you will see a "buy from" dropdown menu which when clicked on, will show the brands the product is available from and allow you to request access to the brand of your choosing.

from brand details

You can click on the "view brand details" link at the top of the pop-out to view the full-screen brand details page where you can also request access.