In this video I walk through a basic process of creating a custom service. This is a good method for exposing some business logics that you want to call from another application into Dynamics AX for integration purposes.

If you wanted to skip some of the work I posted another post here with the download and setup.

https://organicax.com/2014/08/13/custom-service-setup-files/

This was done on Dynamics AX 2012 R2 but the same concept applies with any version of AX2012.

Cheers

Lachlan