In the Resources section of the UsersAPI.
Under /users resource’s {userId} resource, select POST method.
Open the Test tab.
In Test method - Path - userId , fill in d1d2f263-9a93-408c-a836-c13e24fcebf6.
Replace the id value with the id of user created in previous step.

Test.get-user Lambda function is invoked successfully, and the response is the data of the user.