Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "properties": {
+    "trackings": {
+      "anyOf": [
+        {
+          "items": {
+            "additionalProperties": {},
+            "properties": {
+              "events": {
+                "anyOf": [
+                  {
+                    "items": {
+                      "additionalProperties": {},
+                      "properties": {
+                        "courierCode": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Courier code linked to this event; refers to the get_couriers list."
+                        },
+                        "datetime": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "DEPRECATED — use occurrenceDatetime."
+                        },
+                        "eventId": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Unique identifier of this event in Ship24."
+                        },
+                        "eventTrackingNumber": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "The tracking number the event was actually found on."
+                        },
+                        "hasNoTime": {
+                          "anyOf": [
+                            {
+                              "type": "boolean"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "DEPRECATED — true when the courier reported a date with no time."
+                        },
+                        "location": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Raw location text as reported by the courier."
+                        },
+                        "occurrenceDatetime": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "When the event occurred."
+                        },
+                        "order": {
+                          "anyOf": [
+                            {
+                              "type": "number"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Tie-breaker when several events share the same occurrenceDatetime; lower comes first."
+                        },
+                        "sourceCode": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Internal code of the source this event came from. These codes may change at any time."
+                        },
+                        "status": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Raw status text as reported by the courier."
+                        },
+                        "statusCategory": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Ship24 status category for the event."
+                        },
+                        "statusCode": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Ship24 normalised status code for the event."
+                        },
+                        "statusMilestone": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "Milestone at the time of the event: pending | info_received | in_transit | out_for_delivery | failed_attempt | available_for_pickup | delivered | exception."
+                        },
+                        "trackingNumber": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "The original tracking number used to create the tracker."
+                        },
+                        "utcOffset": {
+                          "anyOf": [
+                            {
+                              "type": "string"
+                            },
+                            {
+                              "type": "null"
+                            }
+                          ],
+                          "description": "DEPRECATED — the offset is already carried by occurrenceDatetime."
+                        }
+                      },
+                      "type": "object"
+                    },
+                    "type": "array"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "description": "Tracking events, most recent first."
+              },
+              "shipment": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "delivery": {
+                        "anyOf": [
+                          {
+                            "additionalProperties": {},
+                            "properties": {
+                              "aiPredictiveDeliveryDate": {
+                                "anyOf": [
+                                  {
+                                    "additionalProperties": {},
+                                    "properties": {
+                                      "from": {
+                                        "anyOf": [
+                                          {
+                                            "type": "string"
+                                          },
+                                          {
+                                            "type": "null"
+                                          }
+                                        ],
+                                        "description": "Earliest date of the window."
+                                      },
+                                      "to": {
+                                        "anyOf": [
+                                          {
+                                            "type": "string"
+                                          },
+                                          {
+                                            "type": "null"
+                                          }
+                                        ],
+                                        "description": "Latest date of the window."
+                                      }
+                                    },
+                                    "type": "object"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "Ship24 AI-predicted window. Omitted entirely unless enabled on the account."
+                              },
+                              "courierEstimatedDeliveryDate": {
+                                "anyOf": [
+                                  {
+                                    "additionalProperties": {},
+                                    "properties": {
+                                      "from": {
+                                        "anyOf": [
+                                          {
+                                            "type": "string"
+                                          },
+                                          {
+                                            "type": "null"
+                                          }
+                                        ],
+                                        "description": "Earliest date of the window."
+                                      },
+                                      "to": {
+                                        "anyOf": [
+                                          {
+                                            "type": "string"
+                                          },
+                                          {
+                                            "type": "null"
+                                          }
+                                        ],
+                                        "description": "Latest date of the window."
+                                      }
+                                    },
+                                    "type": "object"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "Window promised by the courier."
+                              },
+                              "estimatedDeliveryDate": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "Estimated delivery date, when the courier provides one."
+                              },
+                              "service": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "Name of the logistics service or product used."
+                              },
+                              "signedBy": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "DEPRECATED — always null."
+                              }
+                            },
+                            "type": "object"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Delivery dates and service level."
+                      },
+                      "destinationCountryCode": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Detected destination country (ISO alpha-2)."
+                      },
+                      "originCountryCode": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Detected origin country (ISO alpha-2)."
+                      },
+                      "recipient": {
+                        "anyOf": [
+                          {
+                            "additionalProperties": {},
+                            "properties": {
+                              "address": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "Recipient address."
+                              },
+                              "city": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "Recipient city."
+                              },
+                              "name": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "Recipient name."
+                              },
+                              "postCode": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "Recipient postal code."
+                              },
+                              "subdivision": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "Recipient state or province."
+                              }
+                            },
+                            "type": "object"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Recipient details. All fields are nulled unless the account may receive personal data."
+                      },
+                      "shipmentId": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Unique identifier of the parcel in Ship24."
+                      },
+                      "statusCategory": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Ship24 status category for the shipment."
+                      },
+                      "statusCode": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Ship24 normalised status code for the shipment."
+                      },
+                      "statusMilestone": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Current milestone; same value set as event.statusMilestone."
+                      },
+                      "trackingNumbers": {
+                        "anyOf": [
+                          {
+                            "items": {
+                              "additionalProperties": {},
+                              "properties": {
+                                "tn": {
+                                  "anyOf": [
+                                    {
+                                      "type": "string"
+                                    },
+                                    {
+                                      "type": "null"
+                                    }
+                                  ],
+                                  "description": "A tracking number linked to the shipment."
+                                }
+                              },
+                              "type": "object"
+                            },
+                            "type": "array"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "All tracking numbers linked to the shipment."
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "description": "General shipment information and current status."
+              },
+              "statistics": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "timestamps": {
+                        "anyOf": [
+                          {
+                            "additionalProperties": {},
+                            "properties": {
+                              "availableForPickupDatetime": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "First occurrence of the available_for_pickup milestone."
+                              },
+                              "deliveredDatetime": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "First occurrence of the delivered milestone."
+                              },
+                              "exceptionDatetime": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "First occurrence of the exception milestone."
+                              },
+                              "failedAttemptDatetime": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "First occurrence of the failed_attempt milestone."
+                              },
+                              "inTransitDatetime": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "First occurrence of the in_transit milestone."
+                              },
+                              "infoReceivedDatetime": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "First occurrence of the info_received milestone."
+                              },
+                              "outForDeliveryDatetime": {
+                                "anyOf": [
+                                  {
+                                    "type": "string"
+                                  },
+                                  {
+                                    "type": "null"
+                                  }
+                                ],
+                                "description": "First occurrence of the out_for_delivery milestone."
+                              }
+                            },
+                            "type": "object"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "When each milestone was first reached; null for milestones never reached."
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "description": "Milestone timestamps for the shipment lifecycle."
+              },
+              "tracker": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "clientTrackerId": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Your own tracker identifier, usable with searchBy=clientTrackerId."
+                      },
+                      "courierCode": {
+                        "anyOf": [
+                          {
+                            "anyOf": [
+                              {
+                                "items": {
+                                  "type": "string"
+                                },
+                                "type": "array"
+                              },
+                              {
+                                "type": "string"
+                              }
+                            ]
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Courier code(s) pinned on this tracker."
+                      },
+                      "createdAt": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "When the tracker was created."
+                      },
+                      "isSubscribed": {
+                        "anyOf": [
+                          {
+                            "type": "boolean"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "False means the tracker is archived and no longer used for tracking."
+                      },
+                      "isTracked": {
+                        "anyOf": [
+                          {
+                            "type": "boolean"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "False means tracking stopped (delivered, inactive or unsubscribed); existing results remain."
+                      },
+                      "shipmentReference": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Your own shipment reference, as supplied at creation."
+                      },
+                      "trackerId": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Ship24 tracker identifier; pass this to get_tracking_results."
+                      },
+                      "trackingNumber": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "description": "Tracking number this tracker follows."
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ],
+                "description": "The tracker this result comes from. Absent for search_tracking, which creates no tracker."
+              }
+            },
+            "type": "object"
+          },
+          "type": "array"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "One entry per matched tracker or shipment."
+    }
+  },
+  "required": [
+    "trackings"
+  ],
+  "type": "object"
+}