ShipX ‑ Shipping Rates & Rules

We have a very complicated set of needs for shipping:

Brands we can't sell outside our market.
Weird shaped products only some couriers will take.
Free delivery over different amounts for different markets.
Products that will fit in an envelope and weight 50g, up to ebikes that weigh 30 kg and are in huge boxes.
API hook up to FedEx.

This is the only app I've found that meets all of our needs. The checkout page part works quickly too.

To get to where I need to be is taking a while because of the sheer number of options we have, but the support has been excellent, particularly Jenifer. I've used the live chat and Jenifer and I also had a Zoom call where she helped me with a setting I was stuck with.

I haven't put the app live yet, but I am very impressed so far, and I'll update this review once it's been running for a few weeks.