In the REST Expose Editor, in the Input tab, you map input parameters from the HTTP request to the ABL operation.

When you map a request parameter, ensure that you map a section of the HTTP request that contains input in the format expected by the procedure, method, or function. For example, if the input parameter of a procedure requires an integer from the path parameter of your URI, then the path parameter must be an integer.

Remember that you will not receive any alerts while mapping. However, at runtime if you pass the wrong parameter type, you will receive an error.