RocketShipIt is the baby of Mark Sanborn, who has spent the last decade working with these shipping APIs. You'll get next-day support directly from the founder, who wrote the code and is an expert in shipping APIs. :-)
Yes, RocketShipIt is software you use on your server that communicates directly with the shipping carrier. This ensures the fastest possible response times and privacy.
You bet. Since RocketShipIt communicates directly from your servers to the carrier, data is never shared with anyone except the carrier. Everything happens over a secure TLS connection. Your credit card is charged securely offsite via Stripe.
Yes, you can try RocketShipIt free for 14 days. You can cancel at anytime.