On integrations, add ‘Webhook’, allowing the user to add a URL and send the data as ‘POST’ with the data formatted as ‘JSON’. This is quite standard and ‘5 minutes to add’.
Don’t expect people to use Zapier. It is expensive. Since you will never add Sendinblue to the integration, at least add Webhook, and many web developers will be happy.
Hello @Stan 
You see, since we get a lot of requests and the process of adding new integrations is not easy, we have to be picky and choose the most popular requests first.
If this request gets more votes, we’ll gladly consider Webhook integration in our future updates.
Thanks a lot for your interest and help, we are always happy to hear from you 