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My PrestaShop 1.7.8.2 connection tests fine in ShipStation and I can import orders at first, but I can't add any new orders after syncing again.  Current ShipStation backend support has a 3 week backlog and I'm not certain if it's simply a PrestaShop setting that is the issue.  I'm looking for someone who is familiar with ShipStation to assist and I will gladly compensate you for your time.  If someone currently has a PrestaShop/ShipStation integration that works, I would love to know what your PS settings are.  We are a small business located in Maryland, USA.

My order status numbers match up perfectly with ShipStation requirements.  The issue appears to be related to the ShipStation "refresh" button not working.  After contacting ShipStation support, they can manually refresh it fine and new orders show up, so it appears their front end refresh isn't working.  I've been trying to launch this new store for 10 days now, but ShipStation has a 3 week support backlog. They tell me I might need to adjust the time zone, so I found four possible time zones for the New York area (US/Eastern, America/New York, ETC-GMT-5, and EST5EDT) and tested them all.  No luck.  Why does PrestaShop have FOUR time zones for my area?  If you are currently using ShipStation and PrestaShop, which time zone setting are you using for both ends?  ShipStation support seems to lean toward this being the issue.

I spent the last 5 weeks prepping this new store and spending money only to be stopped at the finish line by a ShipStation integration.  I have used ShipStation for years, so I know how it works.  I'm out of options and frustrated.   We will pay anyone that can shed light on this situation as there are very few shipping services that have PrestaShop integrations.  Thanks.

SOLUTION:  It took 2 Prestashop developers to figure it out, but the issue was my webhost's (SiteGround) "dynamic cache".  This cache was only flushed every 12 hours unless done manually.  ShipStation would query my server for new orders, but my server would only respond with cached results despite new orders being created.  I had to add the following code to the htaccess file in my store's root directory to ignore the cache. 

<IfModule mod_headers.c>
Header set Cache-Control "private"
</IfModule>

All is well once again.  Another potential issue that some might have is not having Prestashop and ShipStation set to the same time zone.  If your Prestashop orders have a timestamp in the future, ShipStation will not sync them properly.