NPRetail is running on top of the Business Central platform which is developed and maintained by Microsoft.
The newest versions of BC use the OData v4 standard to provide REST webservice APIs.
The base application in the ERP system comes with a big set of APIs and NPRetail adds many additional APIs on top for NaviPartners modules.
Read the Microsoft documentation for an introduction to Business Central APIs, authorization options and tips & tricks:
Technical reference of the base ERP APIs developed by Microsoft:
Our APIs are grouped into various domains/modules. Use the navigation menu to explore each of them.
We maintain an OpenAPI API sandbox for each, which can either be explored directly in your browser or imported into your favourite software that supports OpenAPI 3: