Better way to display images in Magento's default API response? - magento2

Question

I am using Magento2 default API: /V1/carts/mine/payment-information.
The response from this API is:
{
"payment_methods": [
{
"code": "payu",
"title": "PayUMoney"
},
{
"code": "checkmo",
"title": "Check / Money order"
},
{
"code": "paytm",
"title": "Paytm PG"
}
],
"totals": {
"grand_total": 195,
"base_grand_total": 195,
"subtotal": 45,
"base_subtotal": 45,
"discount_amount": 0,
"base_discount_amount": 0,
"subtotal_with_discount": 45,
"base_subtotal_with_discount": 45,
"shipping_amount": 150,
"base_shipping_amount": 150,
"shipping_discount_amount": 0,
"base_shipping_discount_amount": 0,
"tax_amount": 0,
"base_tax_amount": 0,
"weee_tax_applied_amount": null,
"shipping_tax_amount": 0,
"base_shipping_tax_amount": 0,
"subtotal_incl_tax": 45,
"shipping_incl_tax": 150,
"base_shipping_incl_tax": 150,
"base_currency_code": "INR",
"quote_currency_code": "INR",
"items_qty": 1,
"items": [
{
"item_id": 41,
"price": 45,
"base_price": 45,
"qty": 1,
"row_total": 45,
"base_row_total": 45,
"row_total_with_discount": 0,
"tax_amount": 0,
"base_tax_amount": 0,
"tax_percent": 0,
"discount_amount": 0,
"base_discount_amount": 0,
"discount_percent": 0,
"price_incl_tax": 45,
"base_price_incl_tax": 45,
"row_total_incl_tax": 45,
"base_row_total_incl_tax": 45,
"options": "[{\"value\":\"Green\",\"label\":\"Color\"},{\"value\":\"29\",\"label\":\"Size\"}]",
"weee_tax_applied_amount": null,
"weee_tax_applied": null,
"name": "Erika Running Short"
}
],
"total_segments": [
{
"code": "subtotal",
"title": "Subtotal",
"value": 45
},
{
"code": "shipping",
"title": "Shipping & Handling (Fixed)",
"value": 150
},
{
"code": "tax",
"title": "Tax",
"value": 0,
"extension_attributes": {
"tax_grandtotal_details": []
}
},
{
"code": "grand_total",
"title": "Grand Total",
"value": 195,
"area": "footer"
}
]
}
}
I want to add the images tag inside items to display images of the items/products. But this tag is not defined in the interface of items, i.e
TotalsItemInterface.php
I replicated TotalsItemInterface in my custom module and added all getters and setters from Totalsinterface along with setImages and getImages Tag. Thus internally I call the method to use and show it by my custom apiInterfaces.
Is there a better or a proper "Magento 2 way" if we want to change the data displayed in the APIs?

Answer 1

You may use extension attributes for it. You can find more information about them in the devdocs there:
https://devdocs.magento.com/guides/v2.3/extension-dev-guide/extension_attributes/adding-attributes.html