Send email in SF4 with sendinblue api V3 - https://developers.sendinblue.com/docs

send email by sendinblue

$emailData = [
    'tags' => ['registration'],
    'templateId' => 8,//use template you make on sendinblue interface
    'replyTo' => ['email' => 'contact@example.com'],
    'sender' => ['email' => 'noreply@example.com'],
    'to' => [['email' => $user->getEmail()]],
    'params' => ['USERNAME' => $user->getUsername(), "LINK" => $link],//use variable on sendinblue template
];

$result = $this->container->get('App\Services\SendinblueApi')->apiCall('smtp/email', $emailData);

SendinblueApi.php

<?php

namespace App\Services;

use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Class SendinblueApi
 *
 * @package App\Services
 */
class SendinblueApi
{

    /**
     * @var ContainerInterface
     */
    protected $container;

    /**
     * SendindlueApi constructor.
     *
     * @param ContainerInterface $container
     */
    public function __construct($container)
    {
        $this->container = $container;
    }

    /**
     * @param       $uri
     * @param array $data
     *
     * @return mixed
     */
    function apiCall($uri, $data)
    {
        $curl = curl_init();

        // Error waiting a die() order
        if (empty($curl)) {
            die("ERROR curl_init : cURL is not ready");
        }

        $apiKey = $this->container->getParameter('sendinblue_api_key_v3');
        $httpHeader = ['api-key: ' . $apiKey, 'Content-Type: application/json'];
        if (in_array(@$_SERVER['REMOTE_ADDR'], ['127.0.0.1', '::1'])) {
            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        }

        curl_setopt($curl, CURLOPT_URL, $this->container->getParameter('sendinblue_api_url') . $uri);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_ENCODING, '');
        curl_setopt($curl, CURLOPT_MAXREDIRS, 10);
        curl_setopt($curl, CURLOPT_TIMEOUT, 30);
        curl_setopt($curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
        curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'POST');
        curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));
        curl_setopt($curl, CURLOPT_HTTPHEADER, $httpHeader);
        curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 5);

        $result = curl_exec($curl);

        // Error management
        if (curl_errno($curl)) {
            // Show error message
            echo "ERROR curl_exec : " . curl_error($curl);
        }

        curl_close($curl);

        return $result;
    }

}

service.yaml

parameters:
    sendinblue_api_url: 'https://api.sendinblue.com/v3/' # sendinblue api entrypoint
    sendinblue_api_key_v3: 'sendinblueapikey' # sendinblue api
    
App\Services\SendinblueApi:
    arguments: ['@service_container']
    public: true