[WordPress] Gravity Forms send entry to child site (WP)

functions.php

/**
 * Title: Gravity Forms send entry to child site (WP | Enable GF REST API on child site)
 * Author: Mattias Ghodsian
 * Donate a cup of coffee: https://www.buymeacoffee.com/mattiasghodsian
 * Donate Eth: 0xBBB96204E45D11C9799c6B12E6eE6F0d4A071Ef5
 */
add_action( 'gform_after_submission_2', 'post_to_third_party', 10, 2 );
function post_to_third_party( $entry, $form ) {
    $entry['form_id'] = 1; // change form ID to same ID on your child site

    $consumer_key       = '';
    $consumer_secret    = '';

    $headers = [
        'Authorization' => 'Basic ' . base64_encode( "{$consumer_key}:{$consumer_secret}") , 
        'Content-Type'  => 'application/json; charset=utf-8',
    ];

    $endpoint_url   = 'https://site.com/wp-json/gf/v2/entries';
    $response       = wp_remote_post( $endpoint_url, array( 'headers' => $headers, 'body' => json_encode($entry,true) ) );

    if ($response['message'] == "Created") {
        // do nothing
    }else{
        GFCommon::log_debug( 'gform_after_submission: response => ' . print_r( $response, true ) );
    }

}