Custom tip button

Hello, I have a website called Freelancespots. I registered this website to Brave Rewards so I can recieve BAT tips using the little BAT triangle button in the URL bar of the Brave Browser.

The position of that BAT button is not really optimal and I would like to have a custom BAT tip button in my website itself aswell. I know this is possible because Reddit is also using a custom BAT tip button (check the attachment).
bat-tip-button

My question is: how can I make my own BAT tip button, what kind of Javascript do I need to use to open the BAT Tip panel?