Adding Blog ID link in Automessage email

Hello,

Using Automessage plugin, I'd like to provide a new blog user with the url of their website account so they can provide payment after their trial is over. ex. https://automotivewebsource.com/automotive-web-source/?bid=XXX

Can you explain what each of these does, or simply let me know which I would use for this?

%blogname% %blogurl% %username% %usernicename% %sitename% %siteurl% %systemname% %systemurl%

Thanks,
Chris