[Bug]: /trackers endpoint only returns one tracker when utilizing tracking_codes array

[HottieHotton]

Software Version

9.5

Language Version

3.11

Operating System

macOS Sequoia v15.5

What happened?

1. In Python:

• Make Tracker.all call with an array of tracking codes
• Run file
• Only 1 returns from the list...

1. In cURL:

• Follow same stuff as above
• Returns all trackers

What was expected?

The behavior should be the same as what you see in the raw request that I make, where all trackers in the array return

Sample Code

Python Code(broken):
trackers = client.tracker.all(
    tracking_codes=[
        "1501369310",
        "H00I9A0000001810",
        "9234690378493400100750",
        "9400100208303109897400"
    ],
)

cURL code(working, though slightly adjusted from how docs outline a request like this):
curl -X GET "https://api.easypost.com/v2/trackers" \
  -u "ackackackack":
  -H 'Content-Type: application/json' \
  -d '{
    "tracking_codes": ["1501369310", "H00I9A0000001810", "9234690378493400100750", "9400100208303109897400"]
  }

Relevant logs

Python returns:
{
  "trackers": [
    {
      "id": "trk_18fc0a0b1c324064b6253b07541473c3",
      "object": "Tracker",
      "mode": "test",
      "tracking_code": "9400100208303109897400",
      "status": "delivered",
      "status_detail": "arrived_at_destination",
      "created_at": "2025-05-27T16:20:30Z",
      "updated_at": "2025-05-27T16:23:30Z",
      "signed_by": "John Tester",
      "weight": null,
      "est_delivery_date": "2025-05-27T16:23:30Z",
      "shipment_id": "shp_4fd710b2f0a14376a86ad2e93165f079",
      "carrier": "USPS",
      "tracking_details": [
        {
          "object": "TrackingDetail",
          "message": "Pre-Shipment Info Sent to USPS",
          "description": "",
          "status": "pre_transit",
          "status_detail": "status_update",
          "datetime": "2025-04-27T16:23:30Z",
          "source": "USPS",
          "carrier_code": "",
          "tracking_location": {
            "object": "TrackingLocation",
            "city": null,
            "state": null,
            "country": null,
            "zip": null
          },
          "est_delivery_date": null
        },
        {
          "object": "TrackingDetail",
          "message": "Shipping Label Created",
          "description": "",
          "status": "pre_transit",
          "status_detail": "status_update",
          "datetime": "2025-04-28T05:00:30Z",
          "source": "USPS",
          "carrier_code": "",
          "tracking_location": {
            "object": "TrackingLocation",
            "city": "HOUSTON",
            "state": "TX",
            "country": null,
            "zip": "77063"
          },
          "est_delivery_date": null
        },
        {
          "object": "TrackingDetail",
          "message": "Arrived at USPS Origin Facility",
          "description": "",
          "status": "in_transit",
          "status_detail": "arrived_at_facility",
          "datetime": "2025-04-28T15:05:30Z",
          "source": "USPS",
          "carrier_code": "",
          "tracking_location": {
            "object": "TrackingLocation",
            "city": "NORTH HOUSTON",
            "state": "TX",
            "country": null,
            "zip": "77315"
          },
          "est_delivery_date": null
        },
        {
          "object": "TrackingDetail",
          "message": "Arrived at USPS Facility",
          "description": "",
          "status": "in_transit",
          "status_detail": "arrived_at_facility",
          "datetime": "2025-04-29T16:41:30Z",
          "source": "USPS",
          "carrier_code": "",
          "tracking_location": {
            "object": "TrackingLocation",
            "city": "COLUMBIA",
            "state": "SC",
            "country": null,
            "zip": "29201"
          },
          "est_delivery_date": null
        },
        {
          "object": "TrackingDetail",
          "message": "Arrived at Post Office",
          "description": "",
          "status": "in_transit",
          "status_detail": "arrived_at_facility",
          "datetime": "2025-04-29T19:32:30Z",
          "source": "USPS",
          "carrier_code": "",
          "tracking_location": {
            "object": "TrackingLocation",
            "city": "CHARLESTON",
            "state": "SC",
            "country": null,
            "zip": "29407"
          },
          "est_delivery_date": null
        },
        {
          "object": "TrackingDetail",
          "message": "Sorting Complete",
          "description": "",
          "status": "in_transit",
          "status_detail": "status_update",
          "datetime": "2025-04-30T01:12:30Z",
          "source": "USPS",
          "carrier_code": "",
          "tracking_location": {
            "object": "TrackingLocation",
            "city": "CHARLESTON",
            "state": "SC",
            "country": null,
            "zip": "29407"
          },
          "est_delivery_date": null
        },
        {
          "object": "TrackingDetail",
          "message": "Out for Delivery",
          "description": "",
          "status": "out_for_delivery",
          "status_detail": "out_for_delivery",
          "datetime": "2025-04-30T01:22:30Z",
          "source": "USPS",
          "carrier_code": "",
          "tracking_location": {
            "object": "TrackingLocation",
            "city": "CHARLESTON",
            "state": "SC",
            "country": null,
            "zip": "29407"
          },
          "est_delivery_date": null
        },
        {
          "object": "TrackingDetail",
          "message": "Delivered",
          "description": "",
          "status": "delivered",
          "status_detail": "arrived_at_destination",
          "datetime": "2025-04-30T06:14:30Z",
          "source": "USPS",
          "carrier_code": "",
          "tracking_location": {
            "object": "TrackingLocation",
            "city": "CHARLESTON",
            "state": "SC",
            "country": null,
            "zip": "29407"
          },
          "est_delivery_date": null
        }
      ],
      "fees": [],
      "carrier_detail": {
        "object": "CarrierDetail",
        "service": "First-Class Package Service",
        "container_type": null,
        "est_delivery_date_local": null,
        "est_delivery_time_local": null,
        "origin_location": "HOUSTON TX, 77001",
        "origin_tracking_location": {
          "object": "TrackingLocation",
          "city": "NORTH HOUSTON",
          "state": "TX",
          "country": null,
          "zip": "77315"
        },
        "destination_location": "CHARLESTON SC, 29401",
        "destination_tracking_location": {
          "object": "TrackingLocation",
          "city": "CHARLESTON",
          "state": "SC",
          "country": null,
          "zip": "29407"
        },
        "guaranteed_delivery_date": null,
        "alternate_identifier": null,
        "initial_delivery_attempt": "2025-04-30T06:14:30Z"
      },
      "public_url": "https://track.easypost.com/djE6dHJrXzE4ZmMwYTBiMWMzMjQwNjRiNjI1M2IwNzU0MTQ3M2Mz"
    }
  ],
  "has_more": false
}


Whereas cURL returns:
{"trackers":[{"id":"trk_01505e85812e4bd68730012f298bb1f2","object":"Tracker","mode":"test","tracking_code":"1501369310","status":"delivered","status_detail":"unknown","created_at":"2025-06-10T21:42:18Z","updated_at":"2025-06-10T21:45:18Z","signed_by":"John Tester","weight":17.6,"est_delivery_date":"2025-06-10T21:45:18Z","shipment_id":"shp_cee235656c9541af847a61617d632ce5","carrier":"DHLExpress","tracking_details":[{"object":"TrackingDetail","message":"Pre-Shipment information received","description":"","status":"pre_transit","status_detail":null,"datetime":"2025-05-10T21:45:18Z","source":"DHLExpress","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":null,"state":null,"country":null,"zip":null},"est_delivery_date":null},{"object":"TrackingDetail","message":"Shipping label created","description":"","status":"pre_transit","status_detail":null,"datetime":"2025-05-11T16:34:18Z","source":"DHLExpress","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":null,"state":null,"country":null,"zip":null},"est_delivery_date":null},{"object":"TrackingDetail","message":"Picked Up","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-11T21:45:18Z","source":"DHLExpress","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Oakland","state":"CA","country":"US","zip":"94612"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Arrived at Sort Facility","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-12T16:12:18Z","source":"DHLExpress","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Chicago","state":"IL","country":"US","zip":"60290"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Departed Sort Facility","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-13T16:52:18Z","source":"DHLExpress","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Chicago","state":"IL","country":"US","zip":"60290"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Arrived at Distribution Center","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-13T21:45:18Z","source":"DHLExpress","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Radnor","state":"PA","country":"US","zip":"19087"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Out For Delivery","description":"","status":"out_for_delivery","status_detail":null,"datetime":"2025-05-14T15:31:18Z","source":"DHLExpress","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Radnor","state":"PA","country":"US","zip":"19087"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Delivered","description":"","status":"delivered","status_detail":null,"datetime":"2025-05-14T22:54:18Z","source":"DHLExpress","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Radnor","state":"PA","country":"US","zip":"19087"},"est_delivery_date":null}],"fees":[],"carrier_detail":{"object":"CarrierDetail","service":null,"container_type":null,"est_delivery_date_local":null,"est_delivery_time_local":null,"origin_location":null,"origin_tracking_location":null,"destination_location":null,"destination_tracking_location":null,"guaranteed_delivery_date":null,"alternate_identifier":null,"initial_delivery_attempt":"2025-05-14T22:54:18Z"},"public_url":"https://track.easypost.com/djE6dHJrXzAxNTA1ZTg1ODEyZTRiZDY4NzMwMDEyZjI5OGJiMWYy"},{"id":"trk_d6fd98a4e2de4d9bbd4a4e9ab965c2ad","object":"Tracker","mode":"test","tracking_code":"H00I9A0000001810","status":"delivered","status_detail":"unknown","created_at":"2025-06-10T21:39:25Z","updated_at":"2025-06-10T21:42:26Z","signed_by":"John Tester","weight":17.6,"est_delivery_date":"2025-06-10T21:42:26Z","shipment_id":"shp_2fabd59901be4ae78c8e66002e0a9c06","carrier":"Hermes","tracking_details":[{"object":"TrackingDetail","message":"Pre-Shipment information received","description":"","status":"pre_transit","status_detail":null,"datetime":"2025-05-10T21:42:26Z","source":"Hermes","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":null,"state":null,"country":null,"zip":null},"est_delivery_date":null},{"object":"TrackingDetail","message":"Shipping label created","description":"","status":"pre_transit","status_detail":null,"datetime":"2025-05-11T16:31:26Z","source":"Hermes","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":null,"state":null,"country":null,"zip":null},"est_delivery_date":null},{"object":"TrackingDetail","message":"Picked Up","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-11T21:42:26Z","source":"Hermes","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Oakland","state":"CA","country":"US","zip":"94612"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Arrived at Sort Facility","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-12T16:09:26Z","source":"Hermes","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Chicago","state":"IL","country":"US","zip":"60290"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Departed Sort Facility","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-13T16:49:26Z","source":"Hermes","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Chicago","state":"IL","country":"US","zip":"60290"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Arrived at Distribution Center","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-13T21:42:26Z","source":"Hermes","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Radnor","state":"PA","country":"US","zip":"19087"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Out For Delivery","description":"","status":"out_for_delivery","status_detail":null,"datetime":"2025-05-14T15:28:26Z","source":"Hermes","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Radnor","state":"PA","country":"US","zip":"19087"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Delivered","description":"","status":"delivered","status_detail":null,"datetime":"2025-05-14T22:51:26Z","source":"Hermes","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Radnor","state":"PA","country":"US","zip":"19087"},"est_delivery_date":null}],"fees":[],"carrier_detail":{"object":"CarrierDetail","service":null,"container_type":null,"est_delivery_date_local":null,"est_delivery_time_local":null,"origin_location":null,"origin_tracking_location":null,"destination_location":null,"destination_tracking_location":null,"guaranteed_delivery_date":null,"alternate_identifier":null,"initial_delivery_attempt":"2025-05-14T22:51:26Z"},"public_url":"https://track.easypost.com/djE6dHJrX2Q2ZmQ5OGE0ZTJkZTRkOWJiZDRhNGU5YWI5NjVjMmFk"},{"id":"trk_5068547408c14830a9c2c1162b40fee7","object":"Tracker","mode":"test","tracking_code":"9234690378493400100750","status":"delivered","status_detail":"unknown","created_at":"2025-06-04T20:05:00Z","updated_at":"2025-06-04T20:08:00Z","signed_by":"John Tester","weight":17.6,"est_delivery_date":"2025-06-04T20:08:00Z","shipment_id":"shp_d1c6253c38c740db898b0149a942b958","carrier":"UspsShip","tracking_details":[{"object":"TrackingDetail","message":"Pre-Shipment information received","description":"","status":"pre_transit","status_detail":null,"datetime":"2025-05-04T20:08:00Z","source":"UspsShip","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":null,"state":null,"country":null,"zip":null},"est_delivery_date":null},{"object":"TrackingDetail","message":"Shipping label created","description":"","status":"pre_transit","status_detail":null,"datetime":"2025-05-05T14:57:00Z","source":"UspsShip","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":null,"state":null,"country":null,"zip":null},"est_delivery_date":null},{"object":"TrackingDetail","message":"Picked Up","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-05T20:08:00Z","source":"UspsShip","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Oakland","state":"CA","country":"US","zip":"94612"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Arrived at Sort Facility","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-06T14:35:00Z","source":"UspsShip","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Chicago","state":"IL","country":"US","zip":"60290"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Departed Sort Facility","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-07T15:15:00Z","source":"UspsShip","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Chicago","state":"IL","country":"US","zip":"60290"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Arrived at Distribution Center","description":"","status":"in_transit","status_detail":null,"datetime":"2025-05-07T20:08:00Z","source":"UspsShip","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Radnor","state":"PA","country":"US","zip":"19087"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Out For Delivery","description":"","status":"out_for_delivery","status_detail":null,"datetime":"2025-05-08T13:54:00Z","source":"UspsShip","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Radnor","state":"PA","country":"US","zip":"19087"},"est_delivery_date":null},{"object":"TrackingDetail","message":"Delivered","description":"","status":"delivered","status_detail":null,"datetime":"2025-05-08T21:17:00Z","source":"UspsShip","carrier_code":"","tracking_location":{"object":"TrackingLocation","city":"Radnor","state":"PA","country":"US","zi[truncated]