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How we can attach a user to a brand/product id rather than list, so if a user is a free member will be assigned to brand 1 and if a paid member will be assigned to brand 2.
What parameters would we use with the api to use in the php code ? would it be "brand_id" or?
You’ve misunderstood what ‘Brands’ are.
Your “Free” and “Paid” members should all fall under the same “Brand” as they are all under the same product.
You should create a list called “Free” and another list called “Paid”, then sign them up to their respective lists.