Hi, I'm Bram (Indonesia UTC+7)
I m fullstack developer who focus on oauth related project. I saw your listing and just match with my interest. I have many oauth client project, however I ve tried php leage oauth client but I have not used it yet in real project. So far, I implemented many project with manuel-lemos oauth library or adopted vendor SDK.
Here list done project vendor with oauth: facebook page manager, quickbooks invoice exporter, instagram posts scrapper, google map, google drive, dropbox, paypal. I also learn many others like twitter, linkedin etc.
I ll be honest with you that I have less experience in freelancer, but for your peace of mind I will show you my past work related to oauth development.
My current rate is $10/hour for common mid-long project, and for your special project my rate is $30. I like this project and may involve all my skills and experience and can work weekends if this project is urgent.
Have a nice day sir,