Integration with sendinblue.com from contact form 7.

functions.php

<?php

/**
 * 
 * SendInBlue integration with Contact Form 7
 * 
 */

 // SendInBlue API KEY
 if ( !defined( 'API_KEY_SENDINBLUE' ) ) {
    define( 'API_KEY_SENDINBLUE', '<YOUR_SEND_IN_BLUE_API_KEY');
 }
 
 // SendInBlue Hook URL 'createcontact'
 if ( !defined( 'HOOK_URL_SENDINBLUE' ) ) {
    define( 'HOOK_URL_SENDINBLUE', 'https://api.sendinblue.com/v3/contacts');
 }
 
 // Create the new wordpress action hook before sending the email from CF7
 //add_action( 'wpcf7_before_send_mail', 'wpcf7_webhook_sendinblue' );
 
 function wpcf7_webhook_sendinblue( $cf7 ) {
     $submission = WPCF7_Submission::get_instance();
 
    if ( $submission ) {
       $posted_data = $submission->get_posted_data();         
       // SendInBlue List ID - It is located next to the list name on SendInBlue List view.
       $SendInBlue_ListID = 4;
 
       if ( $cf7->id() == '177') {
          // Simple Contact Form fields
          $contact_attributes = array (
             'FULLNAME' => "{$posted_data["your-name"]}",
             'TELEFONO' => "{$posted_data["your-phone"]}",
             'COMPANY' => "{$posted_data["your-company"]}"
          );
       } elseif ( $cf7->id() == '204'){
          // Contact form requesting service and invoice amount
          $contact_attributes = array (
             'FULLNAME' => "{$posted_data["your-name"]}",
             'TELEFONO' => "{$posted_data["your-phone"]}",
             'ESTADO' => "{$posted_data["your-estado"]}",
             'NO_SERVICIO' => "{$posted_data["your-servicio"]}",
             'ULTIMA_FACTURA' => "{$posted_data["your-factura"]}",
          );
       }
       // Body data.
       // https://developers.sendinblue.com/reference#createcontact
       $data = json_encode(array(
             'email' => "{$posted_data["your-email"]}",
             'attributes' => $contact_attributes,
             'listIds' => array($SendInBlue_ListID),
             'updateEnabled' => true
       ));
 
       $args = array(
          'method'       => 'POST',
          'body'         => $data,
          'headers'      => array(
             'accept'       => 'application/json',
             'Content-Type' => 'application/json',
             'api-key'      => API_KEY_SENDINBLUE
          ),
          'timeout'      => 30,
          'redirection'  => 10,
          'httpversion'  => '1.0',
       );
 
       $result = wp_remote_post (HOOK_URL_SENDINBLUE, $args);
       if ( is_wp_error ( $result ) ) {
          throw new Exception ( $result->get_error_message() );
       }
    }
 }