It seems that when shipping fees to Shippo, or rather USPS, are insufficient, additional charges will be billed.

For details, please see the Shippo article updated on October 6, 2017.

• Insufficient Postage Surcharges: Underpaid and short paid postage – Shippo

This is about handling cases where the weight or size measurements of shipped items were incorrect, shipping fees were paid, but the actual USPS costs were higher (= insufficient payment of shipping fees). Well, since the payment amount isn’t enough, my reaction is “well, of course.”

The fact that additional charges weren’t being billed until now makes me wonder if USPS couldn’t track the discrepancy between the fees received from customers and the actual costs.

That’s all from the Gemba, where we use Shippo for cross-border e-commerce services.