I also challenge the notion that higher pay leads to less corruption. If so, then why are Denmark, Finland, New Zealand and Norway ranked higher in the corruption perception index[1], when they are paid much, much less annually (especially Finland)[2]?
[1] https://www.transparency.org/en/cpi/2022 (https://archive.ph/fabjP)
[2] https://en.wikipedia.org/wiki/List_of_salaries_of_heads_of_s... (https://archive.ph/XGbpO)
Of course it's hard to find the "actual corruption" figures, but that doesn't mean the perceptions index is of any value.
These are surveys, so there's a limit to how reliable their results can be. However, I find surveys are a pretty good start when you need to get a general idea on how something does and you can't just measure it. How you value that is up to you, that's why I quote it in my comment.