This endpoint allows you to send a finalized, imported customer invoice or credit note
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 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.

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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.

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This endpoint requires the following scope: customer_invoices:all