code: public void billing_invoicesByPostalMail_POST(Boolean enable) throws IOException {
  		String qPath = "/me/billing/invoicesByPostalMail";
  		StringBuilder sb = path(qPath);
  		HashMap<String, Object>o = new HashMap<String, Object>();
  		addBody(o, "enable", enable);
  		exec(qPath, "POST", sb.toString(), o);
  	}
docs: Enable or disable invoices by postal mail
  
  REST: POST /me/billing/invoicesByPostalMail
  @param enable [required] Send invoices through postal mail
  
  API beta