Laravel how to define relationship based on two models or columns?

I have the following:

//users table
id
name
email
remeber_token
role_id

//roles table
id
name

//products table
id
name

//product_prices 
role_id
product_id
price

The price of the product will vary depending on the user role, how to define the correct relationship so in blade I can do something like:

$product->price

and that will return the correct price depending on the user and the product?

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