Upgrade My Blocktrail SDK to Coinbase SDK - Vikas B.

Hello, I need an experienced Coinbase developer; if you didn't work with Coinbase (bitcoin, Litecoin, Ethereum) before, pls do not bid. I have a custom designed php based website where I have Blocktrail API SKD integrated to process bitcoin transaction through API request. Now, I want to move from Blocktrail to Coinbase. The main cause of moving from Blocktrail to Coinbase is to have option to process Ethereum & Litecoin as well as bitcoin. Coinbase offers all three coin options where blocktrail only offers BTC. Now, you will update my website accordingly so that when an order is placed on the website and payment is successful, coin transaction will happen automatically, if order is in pending mode, I will be able to process coin transaction manually from admin panel. I can do these for bitcoin transaction as I have blocktrail already installed. Also, in the admin panel, bitcoin price and balance etc info is shown for bitcoin, there I need to you to adjust settings/ update settings for ETH and LTC as well. *** First, in admin panel, I need an option to choose whether I want to use Blocktrail SDK or Coinbase SDK. If I choose Blocktrail, it will work like it's doing now. If I choose Coinbase SDK, then these will happen:>> >>> There will be another drop-down option in admin panel saying, What Type of coin I want to use? If I select ETH, the website front-end and back-end will adjust automatically to update and process ETH coins only. If I choose LTC, website will adapt automatically for Litecoin. If I select BTC, it will show BTC info in admin panel and make BTC transaction... Like this. *** If there are few adjustments needed about this, you will make that happen without any extra cost. After discussion, when I award this project to you, you will first accept this project. Then, I will create 50% milestone once you accept project. After seeing progress and 50% work completed, I will create another 50% milestone. I will release full milestone payment at a time WHEN FULL PROJECT IS COMPLETED, NOT BEFORE. If you have any confusion, look at my reviews. After completing this project, I have another project on this same website about user account integration and if you do good job, that project is for you as well and you are welcomed to start that project right away. So, for long term relationship's sake, bid on a REASONABLE price. Thank you.