Google Chrome Plugin Development for Crypto Payment on Amazon

We want to develop just a working prototype to make Crypto-payment (BTC, ETH etc) on [login to view URL] purchase. Search for [login to view URL] ( A google chrome plugin is available). We need someone to develop a prototype for us to do something similar. Please do some research and then respond with your reasonable bid. We have done some research in terms of the API(s) needed. When you respond, please mention the tools, API(s) for making the Crypto/Fiat payment.