Ah pas mal Sendinblue, ils sont 3 fois plus généreux que SendGrid dans le free tier!
Anyway, retournons à nos moutons in English please so that communaute can help too.
I see that the name and email entered by user during checkout is in the Stripe webhook response:
So you can use them in your next module after the webhook. Show us the next module after the webhook, I guess it’s the sendinblue module…?