Need Basic Web API example for my model project

Hi,

I want to use Web API for embedded machine communication. I have an embedded machine that sends 3 parameters value to Web API. In return I get 4 parameters value.

I want to send CardNo, CardPass, SerialNo from embedded machine to Web API and in return I want to receive CustName, CustSurname, Location and Amount.

Can anypne shows me how to do that?

Kind Regards