REST API Authentication Check in Python Script

I need assistance with a Python script that interacts with a REST API. The main purpose of this API in my script is for authentication, and it uses the OAuth method.

Please, I require an expert who can:
- Analyze and troubleshoot the current script
- Ensure it correctly implements the OAuth authentication via the REST API
- Provide recommendations for improvements if necessary

Ideal candidates should have:
- Extensive experience with Python and REST APIs
- In-depth understanding of OAuth authentication method
- Proven track record of delivering similar projects

Thank you.