Birthday bonus! I have never received it. However, I have seen the special birthday symbol on other users account in the chat. I heard that Stake gives birthday bonus, but I don't know how the users receive it. Anyway, is it your certificate/real birthday or your Stake account birthday?
I have received it twice if I remember it correctly.
The first bonus was based on my real birthday because at that time my VIP host asked me about my birthday.
The second bonus was based on my account's date creation (the new birthday bonus system) where users get a special symbol in their username as can be seen in chat or in our own profile.
VIP host sent me the bonus directly to my vault balance IIRC for the birthday bonus, but if users has no VIP yet then I guess they get the bonus from live support.