Hi @AddictmobileUA,
You should of received a confirmation email after applying, and if you got approved, another email stating that you are whitelisted for the Ads API. Can you confirm what App ID or Company name you applied with? I am guessing either your email entered incorrectly or the email went to spam.
We usually take anywhere from a day to a week to whitelist, unless the application is rejected. If you applied a week ago, you should of been approved earlier this week.
Carmen