I've two questions,
1. I've joined the campaign when I was full member, which is today and now I'm Sr. member which is also today, I will be paid as Sr. member, right ?
2. I'm enjoying posting at the off-topic section, will these posts count ?
Of course OT posts count if they are constructive (not trolling nor i agree with...)
Past cases like your was paid based on the last member status (So you should expect to be paid as a senior member)