Sends an invoice for the draft order.
You can include the following parameters in the body of the request:
curl --location --request POST 'https://demo.myshopify.com//admin/api//draft_orders//send_invoice.json'{
    "draft_order_invoice": {
        "to": "first@example.com",
        "from": "j.smith@example.com",
        "subject": "Apple Computer Invoice",
        "custom_message": "Thank you for ordering!",
        "bcc": [
            "j.smith@example.com"
        ]
    }
}