`tokenRequestParams` should be passed into `OAuth2Token#refresh`

[MattIPv4]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Fastify version

5.2.1

Plugin version

8.1.2

Node.js version

22.13.1

Operating system

macOS

Operating system version (i.e. 20.04, 11.3, 10)

15.3.1

Description

👋 As the README notes, when working with Twitch, one has to set tokenRequestParams in the plugin options to allow OAuth to work correctly.

However, the refresh method exposed on a returned token does not make use of tokenRequestParams, so one has to pass them in manually again.

Similarly, the getNewAccessTokenUsingRefreshToken method exposed on the plugin instance itself does not make use of tokenRequestParams.

Link to code that reproduces the bug

https://gist.github.com/MattIPv4/816c5692f822c5a18aaa11d37d7b5536

Expected Behavior

If tokenRequestParams is provided, it should be passed in automatically for all the token requests.