     
     
     /**
-    check if this inputField is valid
+    Check if this input field is valid
     
-    - returns: true if valid input
+    - returns: True if valid input
     */
     override public func isValid() -> Bool {
         return self.textField.text?.characters.count > 0 && self.textField.text?.characters.count < 4

    
    
    /**
     the placeholder string for the current inputField
     
     - returns: an Attributed String that is the placeholder of the receiver
     */


/**
 
 The IssueNumberInputField is an input field configured to detect, validate and present issue numbers for Maestro cards.
 
 */
public class IssueNumberInputField: JudoPayInputField {
