Order transaction amount

Question

In Shopware one can have multiple order transactions for an order. An order_transaction contains an amount which looks as follows;

{
  "quantity": 1,
  "taxRules": [
    {
      "taxRate": 22.0,
      "extensions": [
        
      ],
      "percentage": 100.0
    }
  ],
  "listPrice": null,
  "unitPrice": 12.0,
  "totalPrice": 12.0,
  "referencePrice": null,
  "calculatedTaxes": [
    {
      "tax": 2.16,
      "price": 12.0,
      "taxRate": 22.0,
      "extensions": [
        
      ]
    }
  ],
  "regulationPrice": null
}

What is the difference between the unitPrice and totalPrice? What's the use of the quantity field? There's documentation about Payments in Shopware but doesn't say any details about the amount field.

Answer 1

To put it short:
unitPrice = totalPrice / quantity

In the context of transactions the quantity field isn't really used though. A line item of a cart may have a quantity greater than 1 though and that's where the prices of the unit and the total price of the position may differ. Still, for reasons of conformity, all price fields use a common object structure, which will include all of these fields, even if they may not be fully utilized.