Plugin for WordPress that retrieves content from another website using an API call with cURL or fetch.

<?php
/*
Plugin Name: My Plugin
Description: This plugin retrieves content from another website using an API call.
*/

function my_plugin_shortcode( $atts ) {
  // Extract the attributes
  extract( shortcode_atts( array(
    'url' => 'https://example.com',
  ), $atts ) );

  // Make the API call using fetch
  $response = wp_remote_fetch( $url );

  // If the API call is successful, display the content
  if ( ! is_wp_error( $response ) ) {
    return wp_remote_retrieve_body( $response );
  }
}

add_shortcode( 'my_plugin', 'my_plugin_shortcode' );

To use this plugin, you would simply add the [my_plugin] shortcode to a post or page, like this: [my_plugin url="https://example.com"].

This plugin will make an API call to the specified URL using the fetch function, and if the call is successful, it will display the content on the WordPress site.