code: public static TriggerCreator creator(final String pathAccountSid, 
                                           final URI callbackUrl, 
                                           final String triggerValue, 
                                           final Trigger.UsageCategory usageCategory) {
          return new TriggerCreator(pathAccountSid, callbackUrl, triggerValue, usageCategory);
      }
docs: Create a TriggerCreator to execute create.
  
  @param pathAccountSid The SID of the Account that will create the resource
  @param callbackUrl The URL we call when the trigger fires
  @param triggerValue The usage value at which the trigger should fire
  @param usageCategory The usage category the trigger watches
  @return TriggerCreator capable of executing the create