I have set my International/Canada shipping to integrate with the USPS for Carrier Based Pricing. I have selected an envelope as my default package type so it falls within the dimensions for a Large Envelope (Flat).
Here is my issue: the options for shipping begin with USPS First-Class Package Inernational Service
My products will ship as USPS First Class Large Envelope (FLat) which is signifcantly cheaper than a package. I can't figure out why it is not an option when my settings are for an envelope as my default dimensions.
I have also selected "Automatically offer any new shipping rates which aren't listed here" and the option for a Large Envelope (Flat) does not come up as an option at checkout.
I finally contacted the USPS Web Tools Tech Support today and they told me that everything was set properly and that they would even "reset" my account so that all the International Shipping options would show. The Large Envelope - Flat still does not show as a shipping option. I have still not received a reply back from Shopify as to why it is not working properly.
i think it has to be a Shopify issue becuase I am able to 'test' the USPS calculator from the admin page and when I do the test I can see that first class international is working. yet it does not show up at the top of the page under each country.
I deactivated and reactivated. deleted countries and added them back- still not there.
It worked fine a few weeks ago then suddenly stopped working - and I haven't changed anything!
This fixed my problem
Hmm, it might be that the box size you have entered is simply too large for that shipping rate. What likely happened is you added the large box dimensions and it eliminated that option because it was simply too large. There is a great document on USPS's website, that talks about the cutoff sizes for the USPS First Class International shipping rate.https://www.usps.com/international/first-class-mail-international.htm
This was most likely an issue which has been fixed. Can someone from the thread verify this? Ideally envelope within the dimensions :
22" x 18" x 15"
are definitely eligible for First Class Service. If the issue persists, you can use your own USPS account in the Multi Carrier Shipping label app and get the service without any problem.