I need Ninjatrader 8 External Market Data Feed Adapter development in C#

Hello, I have developed a external market data feed adapter for NT7 using ninjatrader.core.dll and APIs exposed through that. Now I want to have a similar adapter connecting Polygon.io for market data feed using Ninjatrader 8. But NT7 APIs are depricated. So we need to develop a new adapter for NT8.

APIs used for NT7
[I took fxcm.dll and modified the dll with new adapter code]
using NinjaTrader.Adapter;
using NinjaTrader.Cbi;
using NinjaTrader.Data;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Diagnostics;

namespace NinjaTrader.Fxcm

public class FixAdapter : IAdapter, IMarketData, NinjaTrader.Adapter.IOrder


I Adapter and other APIs are not available in NT8 anymore from ninjatrader.core.dll.

So we do need to design a new Ninjatrader.Fxcm class and methods to feed data into ninjatrader and receive data from polygon.io