src/main/java/org/imsglobal/lti2/objects/consumer/StandardServices.java
public static ServiceOffered LTI2ToolProxySettings(String endpoint) {
		ServiceOffered ret = new ServiceOffered();
		ret.setEndpoint(endpoint);
		ret.set_id("tcp:ToolProxySettings");    
		ret.set_type("RestService");
		ret.setFormat(Arrays.asList(TOOLSETTINGS_FORMAT, TOOLSETTINGS_SIMPLE_FORMAT));
		ret.setAction(Arrays.asList("GET", "PUT"));
		return ret;
    }
public static ServiceOffered LTI2ToolProxySettings(String endpoint) {
		ServiceOffered ret = new ServiceOffered();
		ret.setEndpoint(endpoint);
		ret.set_id("tcp:ToolProxySettings");    
		ret.set_type("RestService");
		ret.setFormat(Arrays.asList(TOOLSETTINGS_FORMAT, TOOLSETTINGS_SIMPLE_FORMAT));
		ret.setAction(Arrays.asList("GET", "PUT"));
		return ret;
    }
"endpoint" : "http://lms.example.com/resources/ToolProxy/{tool_proxy_guid}/custom",