Post from Gravity Form to external Form

<?php
// for demo form
add_action('gform_after_submission_3', 'custom_function_name', 10, 2); //change number in gform line to match form number
function custom_function_name($entry, $form) {

    $post_url = 'https://exampleform.com/id/456789'; //the public url for the form
    $body = array( //the first part is the field name of the input on the form
//the second is the gravity forms field name
        'field_51633323' => $entry['1.3'], //first name
        'field_51633324' => $entry['1.6'], //last name
        'field_51633325' => $entry['2'], //company
        'field_51633326' => $entry['3'], //email
        'field_51633327' => $entry['4'], //phone
        'field_51633328' => $entry['5'] //comment box
        );

    $request = new WP_Http();
    $response = $request->post($post_url, array('body' => $body));

}

?>