WooCommerce saves any additional order information in the Post Meta table in a key value format.

While the Email Customizer Plus supports all the built-in default values of the order object, there might be scenarios where you might have used a plugin or created custom fields to save additional information for an order.

A good example is the Shipment Tracking ID. Here is a screenshot showing the custom field

WooCommerce allows adding additional values to every order using the "Custom Fields" section.

This custom field usually gets saved in the wp_postmeta table as a meta_key and meta_value

In the above example,

meta_key = tracking_id (it is always good to use an underscore instead of spaces)
meta_value = 123433535

Similarly, most shipment tracking id plugins save the data to the order (post) meta table. You can easily cross-check with the developer of the plugin to know where they save the data. It would most probably in the order meta (post meta) table.

Step 1: Make sure you created the custom field or get the existing field's key

Go to your WordPress dashboard -> WooCommerce -> Orders

Open an order and scroll to the bottom of the record.

You will see both existing Meta Name/Key and their values for the order.

You can also create new value for the order by click "Enter New" link

NOTE: Once created, this Meta Name / Key will be available in the "Select list" in all other orders. So you can simply select and just enter the values. Save.

Step 2: How to fetch this order meta in email template

Just go to your WooCommerce -> Email Customizer Plus -> Edit the Email Template where you wanted to include the order meta

Add a short code in the following format: {{order_meta.your_meta_key}}

In our example, it will be: {{order_meta.tracking_id}}

When the email is sent, Email Customizer will fetch the correct value for the respective order and its meta key.

Here is a screenshot:

Using this method, you can fetch any dynamic value given in the "order meta" into your emails.