Webservice VB passing parameters to C#

Question

Good morning,

We have two systems, one of them is in VB and the other in C# an identity manager (which serves to unify the login, we will put more systems inside it so that there is only one login user), we have to pass the User and the application ID to the system in C#. this system will check if the user exists, if it exists allows logging in, and the system in VB should pop a message on the screen saying that the user exists, we are using WEB.Api.

From now on, thank you.