This endpoint allows you to send a commercial document 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 commercial document 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.

The subject and body come from the company's default billing email template
for the customer's billing language, unless email_template_id is set.
A proforma uses the invoice template.
A shipping order or a purchasing order uses the quote template.

For more information about email sending, please
read [this guide](https://pennylane.readme.io/v2.0/docs/sending-documents-by-email).

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This endpoint requires the following scope: commercial_documents:all