curl --request GET \
  --url https://api.loopreturns.com/api/v1/happy-returns/shipments/{happy_returns_shipment_id} \
  --header 'X-Authorization: <api-key>'

{
  "loop_shipment_id": 12345,
  "happy_returns_shipment_id": "123456",
  "line_item_count": 2,
  "return_count": 1,
  "created_at": "2024-03-19dT12:34:56+00:00",
  "updated_at": "2024-03-20T12:34:56+00:00"
}