This a good article that describes how to integrate a third party application with D365FO using Data management framework Data Packages and REST API : https://azureintegrations.com/2019/10/15/d365fo-interacting-with-data-management-frame-work-using-rest-api-for-delta-changes-on-entity/
Category: REST API
D365FFO – AX – Data management package REST API
This topic describes the Data management framework's package representational state transfer (REST) application programming interface (API). The package API lets you integrate by using data packages. The REST API can be used with both cloud deployments and on-premises deployments. For on-premises deployments, this functionality is currently available for Microsoft Dynamics 365 for Finance and Operations, … Continue reading D365FFO – AX – Data management package REST API
D365FFO – AX – RECURRING INTEGRATIONS
Recurring integration does the following things: It builds on data entities and the Data management framework.It enables the exchange of documents or files between Finance and Operations and any third-party application or service.It supports several document formats, source mapping, Extensible Stylesheet Language Transformations (XSLT), and filters.It uses secure REST application programming interfaces (APIs) and authorization … Continue reading D365FFO – AX – RECURRING INTEGRATIONS
AX / Dynamics 365 For Finance and Operations blog 