The Personalise-iT 2 module for Magento 2 now supports Print-on-Demand products.
A Print-on-Demand reference can be set against a product in Magento’s catalog admin section (along side the fields for iframe URL).
POD references should be in the form
P-XXXXXXXXXXXXXXX and can be sourced from CPP.
POD products can be directly added to Magento’s cart without needing to go through the iframe personalisation process.
Please update to Personalise-iT 18.104.22.168 to see the new POD reference field.