An authorization code is a unique key assigned by the registrar to a domain. It is used to verify domain name transfers between registrars. Essentially, it is the "password" for a domain name, working to identify the domain owner and establish proper authority during the transfer process.
For the steps to obtain your domain's authorization code, visit our article How do I transfer my domain to another registrar?
For the steps to transfer a domain to your Rebel account using an authorization code from your current registrar, visit our article How do I transfer my domain to Rebel?