The RFA API packages come with a number of Provider examples.
E.g. you have StarterProvider_Interactive and StarterProvider_NonInteractive present in the RFA C++., Java and .NET versions.
The use of each is covered in either the README or package.html files in the sample folders.
However, perhaps the easiest way to get a Provider up and running is to refer to the QuickStart guide found in the Docs folder of RFA Java and C++. This QuickStart provides step by step instructions on how to install, configure and connect a Consumer example to a Provider example.
Yes - you can. The source code for the above Starter examples demonstrates the basic steps required to implement a Provider.
There are more advanced examples that illustrate some of the more advanced implementation techniques required. e.g. the C++ Provider_Interactive example or the RFA Java AdvancedHybridDemo example.
The Developer guides have further details on differences between Interactive and Non-Interactive Providers and also on how to implement them in code.
If you are new to our APIs and have no strong reason for using RFA, then I would recommend using EMA (Elektron Message API) as you should find implementing a Provider using EMA requires less learning and thereby less coding effort.
You can find an EMA NI Provider tutorials on this website:
Much of the EMA NI Provider Tutorial content is relevant to Interactive Providers too.