MERGE TAGS- FLUENT CART

Hello creators.

I am setting up a mail when =Order Paid (Payment/Subscription) = (invoice)

I want to use the merge tags for the product name but dont find it. I used ={{cart_order.type}}

but the outcome is= payment

Also {{cart_order.completed_at}} is the outcome= nothing....

For date i use now for the moment {{other.date.+0 days}}

Annybody the same isseau?