How to make a a secure oauth2.0 API call in dynamics 365

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Hello everyone,
I'm relatively new to the Dynamics world and currently facing a challenge. I've created a new custom connector with OAuth 2.0 and successfully added some connections to it. Now, my goal is to execute an action of the custom connector using C# code. Is this possible, and if so, how can I achieve it?
After successfully calling the API and obtaining the response, my next step is to send this response to a PowerApps Component Framework (PCF) component to display the data. Any guidance or assistance on how to proceed would be greatly appreciated.
Thank you!

What I have tried:

we are open to change the current tech process if they can meet our requirements.