How do I get a OnTrac tracking URL from a tracking number?

Send the tracking number to ShipShim's API (POST /api/v1/track) and it returns the direct OnTrac tracking link, the detected carrier, and a confidence score. For the example number C88888888888888 the tracking URL is https://www.ontrac.com/tracking/?number=C88888888888888.

What if my number matches more than one carrier?

ShipShim returns a ranked list of every matching carrier with confidence scores, and you can lock the result by passing the carrier name or a country hint.

OnTrac tracking URL from a tracking number

Q: What does a OnTrac tracking number look like?

OnTrac tracking numbers follow this format: C prefix + 14 digits, or D prefix + 14 digits. Example: C88888888888888.

OnTrac (US) tracking numbers follow this format: C prefix + 14 digits, or D prefix + 14 digits. ShipShim detects the carrier from the number and returns the direct tracking link.

Example: number in, tracking URL out

Example tracking number	`C88888888888888`
Tracking URL	https://www.ontrac.com/tracking/?number=C88888888888888

This number format is shared by 12 other carriers. ShipShim still returns OnTrac in the ranked matches list from the bare number, and locks onto it (confidence 100) when you pass carrier=OnTrac or a country hint.

Get the OnTrac tracking link via API

curl -X POST https://shipshim.com/api/v1/track \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"tracking_number": "C88888888888888", "carrier": "OnTrac"}'

Response:

{
    "tracking_number": "C88888888888888",
    "carrier": "OnTrac",
    "country": "US",
    "tracking_url": "https://www.ontrac.com/tracking/?number=C88888888888888",
    "confidence": 100,
    "matches": [
        {
            "carrier": "OnTrac",
            "country": "US",
            "confidence": 100,
            "tracking_url": "https://www.ontrac.com/tracking/?number=C88888888888888"
        }
    ]
}

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