This endpoint allows you to send a finalized invoice or an estimate
by email to your customer. This requires that the PDF file for that document
has been generated (this process can take a few minutes), so if you just created
the invoice / estimate in our system, we may return a 409 error. You should
retry the request in a few minutes - if you receive a 204 response, that means
that the email is on its way. For more information about email sending, please
read this guide.

⚠️

Warning: If the invoice is eligible for electronic invoicing, sending

it by email prevents it from later being transmitted through an approved
platform (PA – Plateforme Agréée). For invoices within the scope of the
e-invoicing reform, transmit them through the approved platform instead of
sending them by email.