I want to create a web API in ASP.NET C# that needs to run scheduled jobs from the app.

Since, A and B are two different system altogether, there is no way to connect these two apps directly. So, I want to create my app in such a way that It will connect to an azure function and that azure function will act as a mediator that can get inputs(Payload) from the external system B and run the jobs of A. On this, the complexity of the Payload generation & API Call is shared by the Azure & On-premise EXE. The EXE will call the right Azure Job and the Job workflow is handled by Azure . Please help me the way to build the API/console app in C#.

Without Azure function, I am not getting any options to connect to any external app to get the payloads. Need to know about the way to connect to Azure so that azure can act as a mediator to connect these two external apps.