One of the most popular types of APIs, REST or RESTful APIs are designed to take advantage of existing protocols. The app comes with a ready-to-use RestFul Service. You can write code in the REST section and integrate with other applications.

The app comes with pre-installed REST drivers. You can use the application according to your requirements.
Example GET Function is like this;
public function clients_get() { $id = $this->get('id'); if ($id === NULL) { $list = $this->restservice->customers(); if ($list) { // Set the response and exit $this->response($list, REST_Controller::HTTP_OK); // OK (200) being the HTTP response code } else { // Set the response and exit $this->response([ 'status' => FALSE, 'message' => 'No users were found' ], REST_Controller::HTTP_NOT_FOUND); // NOT_FOUND (404) being the HTTP response code } }How to Enable REST Service
To enable the REST service, you need to create an API key in Settings > REST API.
Answer
The default data response will be in JSON format.
Methods
Some basic functions are added by default. You can edit the `application/controller/Rest.php` file to add more methods.
Example POST method;
public function clients_post() { $id = $this->post('id'); if ($id === NULL) { $list = $this->restservice->customers(); // Check if the users data store contains users (in case the database result returns NULL) if ($list) { // Set the response and exit $this->response($list, REST_Controller::HTTP_OK); // OK (200) being the HTTP response code } else { // Set the response and exit $this->response([ 'status' => FALSE, 'message' => 'No users were found' ], REST_Controller::HTTP_NOT_FOUND); // NOT_FOUND (404) being the HTTP response code } } // Find and return a single record for a particular user. $id = (int)$id; // Validate the id. if ($id <= 0) { // Invalid id, set the response and exit. $this->response(NULL, REST_Controller::HTTP_BAD_REQUEST); // BAD_REQUEST (400) being the HTTP response code } // Get the user from the array, using the id as key for retrieval. // Usually a model is to be used for this. $list = $this->restservice->customers($id); if (!empty($list)) { $this->set_response($list[0], REST_Controller::HTTP_OK); // OK (200) being the HTTP response code } else { $this->set_response([ 'status' => FALSE, 'message' => 'User could not be found' ], REST_Controller::HTTP_NOT_FOUND); // NOT_FOUND (404) being the HTTP response code } } <!-- end row -->