CF7: send submitted data to another URL as JSON

If you need to send data from a Contact Form 7 (CF7) form to another URL you can use this simple PHP script. Just add it in your WordPress functions.php file inside your theme.

// define the URL where data should be submitted, this constant can be stored in your `wp-config.php` file
define('CF7_TO_API_URL', 'https://...........');
function action_wpcf7_mail_sent( $contact_form ) { 
    // you can limit this script to certains forms, just change the IDs (111,222,333) and uncomment line 10 and 47
    // if (in_array($WPCF7_ContactForm->id(), [111,222,333])) {
        $wpcf7      = WPCF7_ContactForm::get_current();
        $submission = WPCF7_Submission::get_instance();
        if ($submission) {
            $data = $submission->get_posted_data();
            $url = $submission->get_meta( 'url' ); // url where the submit come from
            $postId = url_to_postid($url); // from the url we get the post ID
            $postType = get_post_type($postId); // from post ID we get the post type
            $title = get_the_title($postId); // and the title
            $output = [
                "firstname" => $data['firstname'],
                "lastname" => $data['lastname'],
                "email" => $data['email'],
                "phone" => $data['phone'], // add all needed fields
                "source" => $url,
                "is_product" => $postType === 'product', // ex: we want to know if the page was a product (custom post)
                "product_name" => $postType === 'product' ? $title : '', // if it is a product tell me the product name (title)
                "want_newsletter" => $data['newsletter'] === 1  ||   $data['newsletter'] === "1" // ex. for checkbox    
            ];
            $options = array(
                'http' => array(
                    'method'  => 'POST', // you can change the method (GET, POST)
                    'content' => json_encode( $output ), // php array as json
                    'header'=>  "Content-Type: application/json\r\n" .
                        "Accept: application/json\r\n"
                )
            );
              
            $context  = stream_context_create( $options );
            $result = file_get_contents( CF7_TO_API_URL, false, $context );
            $response = json_decode( $result ); // you can use/output the response from 
        }
    // }
}; 
         
// add the action 
add_action( 'wpcf7_mail_sent', 'action_wpcf7_mail_sent', 10, 1 );