Clientexec gateway plugin for using bitpay api

Hi! I need a payment gateway plugin for ClientExec 4.6.2. The plugin must implement the BitPay API (see attached file for more information about the use of the api) payment processor. we will provide the necessary api Key to use the api. The idea is that if a customer chooses to pay in USD,EUR,Bitcoin,etc he can do it. (the bitpay api, converts the amount received in the invoice into bitcoin. we'll provide a working server w/clientexec installed, so you can work without limitations installing the API. There is a working plugin from BitPay for WHMCSS that I belive you can use as guidance. (also attached bellow) or if you can addapt it to clientexec be my guest. Cheers!