C# AWS lambda function with routes

to make one lambda function with 4 routes in it.

All I need it to do is return the parameter back to me. So I pass something to those 4 routes and the route just need to return it back to me.

I should be able to hit those routes in postman or something similar

They lambda function will have a 4 routes:
/makeOrder
/cancelOrder
/modifyOrder
/cancelOrder

Deliverables
code to make one AWS Lambda function and have 4 routes