= Digits.sharedInstance() let oauthSigning = DGTOAuthSigning(authConfig: digits.authConfig, authSession: digits.session()) let authHeaders = oauthSigning.OAuthEchoHeadersToVerifyCredentials() // authHeaders dictionary { "X-Auth-Service-Provider": A URL used to retrieve Digits user account information, "X-Verify-Credentials-Authorization": An OAuth signature for the provided user }