Hello.

You open the Outsystems integration studio and then create the actions, structures needed.

After that there is an icon on top to edit the source code and then you add the code needed into your action.

Then build the solution on Visual studio (or other IDE)

when going back to the Outsystems integration studio  you need to press the update code and then publish it.

Then its done.

Does this help you?

Hi,

you can refer below video link for creating an extension API with C# in Outsystem Integration Studio. just you need to replace your C# API expose code logic with this code. let me know if you have any more question.

https://www.youtube.com/watch?v=WpgCqdmT1vE

thanks

cv

i think this link with help you 

https://www.youtube.com/watch?v=EpwX5CnLUao

Thanks for your suggestions.
You all have the same idea. I got some ideas from you and I have done it.