If you are experiencing that your orders are not closing correctly in Shopify, we have a solution for you.
In Shopify, you should navigate to Sales Channels > Point of Sale > Locations and select the location marked as the "Shipping origin".
At the top of your screen, in the address bar, you should see something like the following:
Now simply input the ID from Shopify into Webshipper > Settings > Locations > External location.
And that's it. You're all done and the store id is now updated in Shopify.