easyRates: 日本郵便

===UPDATE=== After the review, the team came back to us and addressed all our concerns. They added the shipping method we were missing, and the rounding methods work. We had a few email exchanges, and they responded quickly and with clear answers. We are now using this app, and it works great. So we have changed our mind and can recommend this app with a good support behind. ===END UPDATE===
The App does (almost) what it is intended to do. It offers the JP POST rates at your checkout based on the weight of the order. So if it fits your needs, you should adopt it. However, there are 3 negative points that will prevent us from using it, and choose another way for now: 1- It does not integrate all JP POST shipping methods. We use Surface-Small Packet a lot, but it is not available with this App. 2- If you sell in multiple currencies, the App converts currencies, apparently based on Shopify's exchange rates, but it does not use Shopify's rounding method. 3- We have contacted the support about the 2 issues above. They gave us a wrong answer regarding the rounding method, as they told us that the app uses Shopify's rounding methods, which is not true (I have a screenshot of our checkout in different currencies to prove it). Then, regarding the missing shipping method (Surface-Small Packet), they said they will talk to the development team about it but that "it may not be for a while", which is something I don't want to hear when I'm paying every month for an app that I expect to be well maintained and updated. That really let us think that this App is not a priority for this business. We'll be happy to try it again, and change our review, when these changes are implemented (at least the Surface-Small Packet integration which we think should be a simple improvement to implement).