Update Registrations By Email API

This API purpose is the same as UPDATE Registration by ID API except the difference is that we use Email ID instead of Registration ID. Also, we are allowed to update the registration with the same set of fields as the above API:

Try it out : https://www.postman.com/cloudy-moon-324265/workspace/eventnx-external-api-demo/request/15605334-0e0c5f96-6323-4ef4-93bc-ea5caf4a3dfd