Thank you all for your feedback! This is the developer for the facebookadsextension module.
The facebook ads extension sync products to facebook catalog in 2 ways
1. The initial product sync uses a feed file
2. Subsequent product sync uses real time API whenever a product change is made
We have released a latest version v1.0.14 which solves the problem of wrong encoding during the initial product sync. The reason is due to the missing encoding for the feed file when the feed file was created. The code which fixes this is https://github.com/facebookincubator/Facebook-For-OpenCart/blob/master/upload/admin/controller/facebook/facebookproductfeed.php#L171
We have also open sourced our code in https://github.com/facebookincubator/Facebook-For-OpenCart and we welcome all suggestions to improve the plugin and make it more robust for more OpenCart users.
