      */
     open class var accountSid: String? {
         set {
-            sharedInstance.accountSid = newValue
+            shared.accountSid = newValue
         }
         get {
-            return sharedInstance.accountSid
+            return shared.accountSid
         }
     }
     

     */
    open class var accountToken: String? {
        set {
            sharedInstance.accountToken = newValue
        }
        get {
            return sharedInstance.accountToken
        }
    }
    
    // MARK: - Methods
    
    /**
     Use this method to lookup on Twilio for a certain phone number. You can also pass the country ISO code and the type.

     
     - seealso: TwilioLookupResponse
     */
    
    public func lookup(_ phoneNumber: String, countryCode: String?, type: String? = nil, addOns: [TwilioAddOn]? = nil, completion: @escaping (TwilioLookupResponse?, Error?) -> ()) {
        
        var parameters: [String: Any] = [:]
        
