What is OAuth?
OAuth (or Open Authorization) lets you share access to a Twitter account without actually sharing the username or password.
OAuth acts as a liaison between Arrow and the brand's Twitter account by providing a temporary access token.
Every campaign requires brand authorization via OAuth to listen for opt-ins and send the automated responses.
Arrow automatically destroys the access token five days after all brand authorized campaigns have ended.
For more information, check out Twitter's About third-party applications and log in sessions page.