Need help on Issue with OAuth Routing in Custom Power Automate Connector

[ParameshToshakaniTR]

We are building a custom Power Automate connector for HighQ with requirements to prompt for:

Client ID
Secret Key
Host URL
Auth URL

However, when implementing the OAuth flow using scripts/custom code, the routing does not work as expected. Instead of using the Client ID and Host URL, it redirects directly to the Host URL.
While reviewing GitHub, we found your connector to be very similar to our requirements. The Microsoft team mentioned they cannot assist with custom code.
Request:
Could you guide us with any documentation, references, or best practices? Even a high-level overview would be helpful. Also, are there any specific tools or approaches you recommend for handling this scenario?

Thanks in advance!