This is for Woo to Square. Not Square to Woo.. If your problem is the latter than don’t read my message.
I had this same problem. I added sku’s to all my products. You can use a plugin to make sku’s automatically if you dont care about sku’s.
They put it on the requirements on their site not here. Also, this should be next to the manual export button. Like a notice or when the plugin gets installed by a notification.
Requirements
WooCommerce 2.6.0+
PHP version 5.3+
WordPress 4.4+
cURL installed on your server
Square account
An SSL Certificate
A business location set in your Square account
Syncing products with WooCommerce Square requires that you have SKUs assigned to all products, including each product variation (if applicable).
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This reply was modified 6 years ago by moptop.