Can we tag or assign additional data like a payment transaction ID to the order in Smart Phone Order?

While the app does not support custom tagging fields, you can still attach additional data, such as payment transaction IDs by using the order notes section.

Whether you're placing a Phone Order or using the Bulk Order Import, you can include any relevant information—like transaction IDs, payment references, or internal notes—within the order notes field.

This is a flexible way to store and reference important order-specific information, and it will appear in the order details within Shopify.