InventoryAPI by Erply is a powerful backend for web shops, and more.
This is a list of all pos related API functions. Click on function name and you'll find all required and optional input parameters and response fields.
images), so if you need to query product information anyway, getProducts can also provide you the list of images for each product.
getSalesReportcan output either detailed data or aggregate it as needed: it can provide totals by products, by product groups, by dates, by locations, etc.