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Please excuse me if I am asking a dumb question, but I am new to Magento and frankly, my first impression is that it is over-designed and poorly documented. Maybe this is part of their business model, or maybe I am missing something. I hope I am missing something!

In my country, every invoice has to mention the date when was created and a date by which the client has to make the payment. The fact that (from what I can tell) Magento doesn't automatically generate an invoice for each order placed, tells me that these dates should be attributes of the invoice, and not attributes of the order.

I have made a plugin using the following code:

app/code/ideologic/RoInvoice/etc/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
 <preference for="MagentoSalesModelOrderPdfInvoice" type="ideologicRoInvoiceModelOrderPdfInvoice" />
 <type name="MagentoSalesModelOrderInvoice">
 <plugin sortOrder="1" name="setDueDate" type="ideologicRoInvoiceModelOrderInvoice" />
 </type>
</config>

app/code/ideologic/RoInvoice/Model/Order/Invoice.php

<?php
/**
 * Copyright © SC ideologic SRL, All rights reserved.
 */
namespace ideologicRoInvoiceModelOrder;

class Invoice


 public function beforeSetCreatedAt(MagentoSalesModelOrderInvoice $invoice, $createdAt)
 $invoice->addData(array('DueDateDelay'=>15));
 return $createdAt;
 

But for some reason the addData() function call has no effect. When I am calling getData() from app/code/ideologic/RoInvoice/Model/Order/Pdf/Invoice.php I am getting a null value (or empty string).

From what I have read, I have to load the 'Model' before calling setData(). How do I do that? Any help will be appreciated!

I know this doesn't directly answer your question but is a solution to one of your issues.

Certain payment methods wont invoice automatically. They need manual attention.

I put together this externsion to automatically invoices orders based on certain conditions.

https://github.com/DominicWatts/AutoInvoice

So solves that part