How do I price recipes for my business using the Pay What You Want app?

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If I want To set up a business on Shopify where customers can send me recipes and pay me based on how the dish looks and tastes, how do I calculate the materials used to make the food, how much time it took me to make the food, or for how the customer wanted to have the food for pickup or delivery by using an app on shopfiy called Pay What You Want?