Copy / Desktop App (C# on Windows / $500) - 2

Please read this post very carefully. I know a company who has developed an app to post on Facebook Marketplace automatically. However, the application does not use any API / Permissions to do this. The app is connected to company V12 sites user account with inventory (connected with token) Please see attached screenshots. Its posting from users personal facebook page from interface that runs in background. It needs to be the same like a human is doing it. If you feel confident to build this and are willing to do it - I will pay $500 after you have working prototype. Please type "218" in your cover letter if you agree to this. I have tried to find developer to do this for last 1 month. I want someone who want to work fast and have job in future. Current company v12, i have much information about the app. I have many of my own customers using the V12 app, because i do not have my own. I want to replicate the way they have done this. I don't want to make it fancy, i want a solution. Currently, after install the app, need to check log to see any error and be sure its posting live to marketplace. Please!