I got it to "work" somehow by doing this to fix my error since we only ship to the US anyway.

Code:
"delivery_country": "US",
I am having issue with the delivery date though.

I got the plugin to work specifying today date ( i.e. "estimated_delivery_date": "2023-01-18")

what do i need to do so the date rendered is the purchase date?

Thank you for your help