Access Key ID
[Access Key ID and Secret Access Key] (http://docs.aws.amazon.com/general/latest/gr/aws-sec-cred-types.html#access-keys-and-secret-access-keys)
Secret Access Key
[Access Key ID and Secret Access Key] (http://docs.aws.amazon.com/general/latest/gr/aws-sec-cred-types.html#access-keys-and-secret-access-keys)
Access Token of current session
AWS credentials needed for RestClient