How to add customer note in WooCommerce PDF Invoice and other labels
PDF Invoice and Packing Slip plugin for WooCommerce by WebToffee helps you to automatically generate invoices, packing slips, delivery notes, and proforma invoices with the customer’s note in it. The order note given by the customer at the checkout can be easily displayed on these documents very easily.
Customer/Order Note
In WooCommerce, a customer is given the option to add an order note below the shipping address at the checkout. This note is significantly important for the store owner as these messages are used for conveying additional information regarding their order.

The store owner can view the Order note from the WooCommerce Orders page as shown below.

Add Customer Note in Invoice – Settings
Step 1: Install and activate the PDF Invoice and Packing Slip plugin for the WooCommerce plugin. Know more.
Step 2: Go to WooCommerce > Invoice/ Packing > Invoice Settings
Step 3: Move on to the Advanced tab. You can see the window as shown below:

Additional details pertaining to the order or products are appended within the invoice using the order meta or product meta fields. You can include them by selecting the required item from the drop-down.
From the Order meta fields dropdown, choose Customer note to include a customer note in the invoice, as shown below:

The settings can be saved by clicking on the Update Settings button.
Learn more about how additional fields are added in invoice.
Invoice with Customer Note
A sample invoice with customer note will be as shown below:

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Comment (1)
Chris
December 12, 2018
What if I want to add the WordPress Post ID of the order on the PDf invoice? What meta key is the Post ID?