The full URL request reads:
POST - https://playgroundapi.ost.com/users/airdrop/status?airdrop_uuid=AIRDROP_UUID&api_key=API_KEY&request_timestamp=EPOCH_TIME_SEC&signature=SIGNATURE
However, the request is actually a GET request.
Also, "airdrop" in the header text of the page is spelled incorrectly (its missing the R in air).
Thank you for pointing it out! We are working on updating the API documentation and releasing it this Wednesday.