The infrastructure used by network operators to deliver services to users at the edge of the network is evolving towards a Cloud-native one. As a consequence, end-to-end services are implemented as chains of PNFs and VNFs and an automated process is required to manage their lifecycle. The Open Network Automation Platform (ONAP) project is one of the available alternatives allowing to manage this kind of services, providing service design, creation, KPI monitoring and control loop capabilities. In order to help Communication Service Providers (CSPs) to manage the described infrastructure and all the business operations related to it, the TM Forum organization has standardized a suite of REST based APIs in its Open API program.