Weekly ingredient orders for a meal kit company

Your meal kit company delivers about 40,000 boxes a week. Each box is for 2 or 4 people and holds 3 or 4 recipes from a menu of 30. Customers can change or skip next week's box until Wednesday at 23:59.

Each recipe lists its ingredients per serving, such as 180 g of chicken thigh, 1 lime or 15 ml of soy sauce. Suppliers sell in packs, such as a case of 48 limes or a 5 kg bag of rice. Each supplier takes orders through an API. It refuses a second order with an order number it has already seen. Every order must be in by Thursday at 09:00. Last month a rerun of the old script sent one supplier the same order twice.

Which data does Thursday's ordering job read, and how does it turn boxes into packs to buy?