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Re:Show HN: Postmaster - an easy API for shipping on the web by m3ntat on Monday October 01, 2012 @06:21PM (#4599643)
A1: Yes, you can reference them by the carrier tracking number (although you could not void/modify a shipment that wasn't created by your carrier account).

A2: Do those have a tracking number pre-printed? If so, yes. It will also work with a UPS InfoNotice or Waybill #.

A3: Yes! We have "best-effort" functionality, it will be expanded to add more complex statements, but we currently have "Send best price from X to Y within N days."

A4: Yes, if you rate is lower than ours and you are over a certain shipping threshold.

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