code: public void billingAccount_service_serviceName_offerChange_POST(String billingAccount, String serviceName, String offer) throws IOException {
  		String qPath = "/telephony/{billingAccount}/service/{serviceName}/offerChange";
  		StringBuilder sb = path(qPath, billingAccount, serviceName);
  		HashMap<String, Object>o = new HashMap<String, Object>();
  		addBody(o, "offer", offer);
  		exec(qPath, "POST", sb.toString(), o);
  	}
docs: Add a new offer change
  
  REST: POST /telephony/{billingAccount}/service/{serviceName}/offerChange
  @param offer [required] The future offer
  @param billingAccount [required] The name of your billingAccount
  @param serviceName [required]