It is required to search on-line (using your search engine of choice) for examples which use two or more API services in a Node-RED flow. There are no limitations for your on-line search. There are only THREE requirements for your application:
1. Node-RED flow must use at least two cloud services
2. Node-RED flow (application) must have real business applicability, and functionality
3. Node-RED flow must be more advanced than the generic flows, More details available.
In addition to your on-line search (using your search engine of choice) you can optionally explore and use any of the following on-line Node-RED examples provided below:
Build a simple earthquake monitoring system
More examples provided.