ps-rest-api.php

<?php
/*
Plugin Name: Horror Movie API Example Plugin
Plugin URI: https://example.com/
Description: Example using the HTTP API to parse JSON from a remote horror movie API
Author: WROX
Author URI: http://wrox.com
*/

// Register custom post type
add_action( 'init', 'ps_register_custom_post_type' );

// Register the movies custom post type
function ps_register_custom_post_type() {
 
    register_post_type( 'movie',
        array(
            'labels' => array(
                'name' => 'Movies',
                'singular_name' => 'Movie'
            ),
            'supports'  => array( 'title', 'editor', 'excerpt', 'author', 'thumbnail', 'custom-fields' ),
            'public' => true,
            'has_archive' => true,
            'rewrite' => array( 'slug' => 'movies' ),
            'show_in_rest' => true,
        )
    );
}

// Register a custom page for your plugin
add_action( 'admin_menu', 'ps_create_menu' );
             
function ps_create_menu() {
             
    // Create custom top-level menu
    //add_menu_page( 'Movies Page', 'Movies', 'manage_options', 'ps-movies', 'ps_movie_api_results', 'dashicons-smiley', 99 );

    add_submenu_page( 'edit.php?post_type=movie', 'Movie Importer Page', 'Import Movies', 'manage_options', 'ps-movies', 'ps_movie_api_results' );
    
}

// Request and display Movie API data
function ps_movie_api_results() {

    // Set your API URL
    $request = wp_remote_get( 'https://sampleapis.com/movies/api/horror' );

    // If an error is returned, return false to end the request
    if( is_wp_error( $request ) ) {
        return false;
    }

    // Retrieve only the body from the raw response
    $body = wp_remote_retrieve_body( $request );

    // Decode the JSON string
    $data = json_decode( $body );

    // Verify the $data variable is not empty
    if( ! empty( $data ) ) {
        
        echo '<ul>';

        // Loop through the returned dataset 
        foreach( $data as $movies ) {

            //check if we already have a total stored for today's date
            echo 'CHECKING MOVIE: ' . esc_html( $movies->title );

            $existing_movie = get_page_by_title( esc_html( $movies->title ), OBJECT, 'movie' );

            if ( !$existing_movie ) {

                // No entry exists, so let's create one

                echo '<li>';
                    echo 'Movie imported: ';
                    echo '<a href="https://www.imdb.com/title/' . esc_attr( $movies->imdbId ) . '" target="_blank">';
                    echo esc_html( $movies->title );
                    echo '</a>';
                echo '</li>';

                // Set values for our new movies post
                $new_post = array(
                    'post_title'    => esc_html( $movies->title ),
                    'post_content'  => '<a href="https://www.imdb.com/title/' . esc_attr( $movies->imdbId ) . '">' .esc_html( $movies->title ). '</a>',
                    'post_status'   => 'publish',
                    'post_author'   => 1,
                    'post_type'     => 'movie',
                );
                
                // Insert the post into the database
                $new_post_id = wp_insert_post( $new_post );
     
                // Sideload the image to the media library
                $image_id = media_sideload_image( esc_url( $movies->posterURL ), $new_post_id, esc_html( $movies->title), 'id' );

                // Set image as featured on the post
                set_post_thumbnail( $new_post_id, $image_id );

                //exit();

            }else{

                // Movie entry exists, so we are skipping

                echo '<li>';
                    echo 'Movie DUPLICATE: ';
                    echo '<a href="https://www.imdb.com/title/' . esc_attr( $movies->imdbId ) . '" target="_blank">';
                    echo esc_html( $movies->title );
                    echo '</a>';
                echo '</li>';

                //exit();

            }

        }

        echo '</ul>';
    }

}