{
"tracking_number": "1234567890",
"sender": {
"name": "John Doe",
"address": "123 Main St, Anytown, USA"
},
"recipient": {
"name": "Jane Smith",
"address": "456 Elm St, Othertown, USA"
},
"weight": 2.5,
"postage_type": "Priority Mail",
"postage_cost": 10.00
}