Hi, can anyone educate me on Form 39 a bit?

We recently sent some parcels to UP through FedEx, and they are saying they can’t process it further because the state of UP requires you to attach Form 39 with every parcel.

Now based on my limited research I understand that it’s something where the government interaction is required that too from the customer’s side, which is absolutely out of question in ecommerce environment. Maybe I am missing something here, can anyone shed some light on it please?