Hi,
Hope you are doing great.
So you need to redeveloped the controller part for your APIs which is written in CI.
I am Koushik Das, having experience in Android and php both.
I can do this easily for you as well as can provide you the API collection, so that you can test the APIs easily.
I have a few questions,
How many APIs are there?
What is the current CI version you have?
Let's connect via chat and discuss further.