Add EDD license system

edd-license-activate.php

<?php

$test_license = '';
$license_data = '';
define( 'DT_KEY', 'edd_sample_theme_license_key_status');
define( 'EDD_SL_STORE_URL', 'https://codenpy.com' ); /* IMPORTANT: Do not modify this line of code, the theme could stop working correctly */
define( 'EDD_SL_THEME_NAME', 'Industrue - Industrial & Factory WordPress Theme' ); /* IMPORTANT: Do not modify this line of code, the theme could stop working correctly */
if ( !class_exists( 'EDD_SL_Theme_Updater' ) ) {
    include( dirname( __FILE__ ) . '/edd-class-file-here.php' );
}
function edd_sl_sample_theme_updater() {
$test_license = trim( get_option( 'edd_sample_theme_license_key' ) );
$edd_updater = new EDD_SL_Theme_Updater( array(
    'remote_api_url' 	=> EDD_SL_STORE_URL, 	
    'version' 			=> '1.0.0', /* IMPORTANT: Do not modify this line of code, the theme could stop working correctly */
    'license' 			=> $test_license, 		
    'item_name' 		=> EDD_SL_THEME_NAME,
    'author'			=> 'codenpy') ); /* IMPORTANT: Do not modify this line of code, the theme could stop working correctly */
}

add_action('admin_menu', 'add_psyplay_license_menu');
function add_psyplay_license_menu() {
    add_theme_page('Theme License', 'Theme License', 'manage_options', 'psythemes');
}
add_action( 'admin_init', 'edd_sl_sample_theme_updater' );

function edd_sample_theme_license_menu() {
    add_menu_page( 'License', 'License', 'manage_options', 'psythemes', 'edd_sample_theme_license_page','dashicons-admin-network');
}
add_action('admin_menu', 'edd_sample_theme_license_menu');

function edd_sample_theme_license_page() {
$license 	= get_option( 'edd_sample_theme_license_key' );
$status 	= get_option( 'edd_sample_theme_license_key_status' );
?>
<div id="acera-content" class="wrap tab-content" style="display: block;">
<div class="acera-settings-headline">
<a href="https://psythemes.com/" target="_blank">
<img class="psythemes" src="<?php echo get_stylesheet_directory_uri()."/includes/core/framework/"; ?>images/logo.png">
</a>
</div>
<form method="post" action="options.php">
<?php settings_fields('edd_sample_theme_license'); ?>
<table class="form-table">
<tbody>
<tr valign="top">
<th scope="row" valign="top">
<?php _e('License Key','psythemes'); ?>
</th>
<td>
<input id="edd_sample_theme_license_key"  name="edd_sample_theme_license_key" type="text" class="regular-text mundotxt" value="<?php echo esc_attr( $license ); ?>" />
<label class="description" for="edd_sample_theme_license_key"><?php _e('Enter your license key','psythemes'); ?></label>
</td>
</tr>
<?php if( false !== $license ) { ?>
<tr valign="top">
<th scope="row" valign="top"><?php _e('License Status','psythemes'); ?></th>
<td>
<?php if( $status !== false && $status == 'valid' ) { ?>
<span class="mundo"><span class="dashicons dashicons-admin-network"></span> <?php _e('Active','psythemes'); ?><br></span>
<i class="cmsxx"><?php echo $_SERVER['HTTP_HOST']; ?></i>
<?php wp_nonce_field( 'edd_sample_nonce', 'edd_sample_nonce' ); ?>
<input type="submit" class="button-secondary mundobt" name="edd_theme_license_deactivate" value="<?php _e('Deactivate License','psythemes'); ?>"/>
<?php } else { wp_nonce_field( 'edd_sample_nonce', 'edd_sample_nonce' ); ?>
<span class="error"><span class="dashicons dashicons-dismiss"></span><?php _e('Inactive','psythemes'); ?></span>
<i class="cmsxx"><?php echo $_SERVER['HTTP_HOST']; ?></i>
<input type="submit" class="button-secondary mundobt" name="edd_theme_license_activate" value="<?php _e('Activate License','psythemes'); ?>"/>
<?php } ?>
</td>
</tr>
<?php } ?>
</tbody>
</table>
<?php submit_button(); ?>
</form>
<?php
}

function edd_sample_theme_register_option() {
    register_setting('edd_sample_theme_license', 'edd_sample_theme_license_key', 'edd_theme_sanitize_license' );
}
add_action('admin_init', 'edd_sample_theme_register_option');

function edd_theme_sanitize_license( $new ) {
    $old = get_option( 'edd_sample_theme_license_key' );
    if( $old && $old != $new ) {
        delete_option( 'edd_sample_theme_license_key_status' ); 
    }
    return $new;
}
function edd_sample_theme_activate_license() {
    if( isset( $_POST['edd_theme_license_activate'] ) ) {
        if( ! check_admin_referer( 'edd_sample_nonce', 'edd_sample_nonce' ) )
            return; 
            global $wp_version;
            $license = trim( get_option( 'edd_sample_theme_license_key' ) );
            $api_params = array(
                'edd_action' => 'activate_license',
                'license' => $license,
                'item_name' => urlencode( EDD_SL_THEME_NAME )
            );
        $response = wp_remote_get( add_query_arg( $api_params, EDD_SL_STORE_URL ), array( 'timeout' => 15, 'sslverify' => false ) );
        if ( is_wp_error( $response ) )
        return false;
        $license_data = json_decode( wp_remote_retrieve_body( $response ) );
        update_option( 'edd_sample_theme_license_key_status', $license_data->license );
    }
}
add_action('admin_init', 'edd_sample_theme_activate_license');


function edd_sample_theme_deactivate_license() {
    if( isset( $_POST['edd_theme_license_deactivate'] ) ) {
    if( ! check_admin_referer( 'edd_sample_nonce', 'edd_sample_nonce' ) )
        return;
     
    $license = trim( get_option( 'edd_sample_theme_license_key' ) );
    $api_params = array(
        'edd_action'=> 'deactivate_license',
        'license' 	=> $license,
        'item_name' => urlencode( EDD_SL_THEME_NAME ) 
    );

    $response = wp_remote_get( add_query_arg( $api_params, EDD_SL_STORE_URL ), array( 'timeout' => 15, 'sslverify' => false ) );
    if ( is_wp_error( $response ) )
        return false;

    $license_data = json_decode( wp_remote_retrieve_body( $response ) );
    if( $license_data->license == 'deactivated' )
        delete_option( 'edd_sample_theme_license_key_status' );
    }
}
add_action('admin_init', 'edd_sample_theme_deactivate_license');



function edd_sample_theme_check_license() {
    global $wp_version;
    $license = trim( get_option( 'edd_sample_theme_license_key' ) );
    $api_params = array(
        'edd_action' => 'check_license',
        'license' => $license,
        'item_name' => urlencode( EDD_SL_THEME_NAME )
    );
    $response = wp_remote_get( add_query_arg( $api_params, EDD_SL_STORE_URL ), array( 'timeout' => 15, 'sslverify' => false ) );
    if ( is_wp_error( $response ) )
        return false;
        
    $license_data = json_decode( wp_remote_retrieve_body( $response ) );
    if( $license_data->license == 'valid' ) {
        return true;
    }
}


// function that check is license VALID or NOT
if (edd_sample_theme_check_license()) {
    //do whatever you want to do if license is valid
}