Bulk listing, Shipping Service Code, can´t find 'untracked letters'

[compendiumshop_sale]

I'm trying to build a template to bulk list from excel, I want to set shipping as Standard postage (Australia Post Domestic Regular Letter Untracked) but can´t find the Shipping Service Code here: https://developer.ebay.com/devzone/xml/docs/reference/ebay/types/ShippingServiceCodeType.html

I've tried with different codes like  AU_Regular, etc. But can´t find the one for letter untracked. Has anyone done this before?

Thanks

[*sons_n_daughters*]

Are the dimensions in your listing under 20mm? If it's not, the letter option won't appear.

[gec2002]

As mentioned make thickness less than 2cm. 

The codes to use are

ShippingService-1:Option 

Either 

AU_AusPostStandardLetter

Or 

AU_AusPostStandardLetterWithTracking

Alternatively you can set up eBay Business Policies (under Account Settings) and enter a new column in your csv file named

ShippingProfileName

and enter the name of the relevant Postage Policy you created.