Attributes in WooCommerce needs be added in two files, as they are used to sync products manually and automatically when changes are made in the webshop.

These are the files:
wp-content->plugins->clerkio->includes->class-clerk-product-sync.php
in the function add_product 

wp-content->plugins->clerkio->includes->class-clerk-rest-api-php
in the function product_endpoint_callback in $productArray

Each attribute is structured like this:
'sku'   => $product->get_sku(), 

 
where 'sku' defines the name you want it to have in Clerk.io, and => $product->get_sku(), is a WooCommerce logic for pulling the attribute.

Finally, go to my.clerk.io -> Data Sync and click Start Sync to import your new attributes.

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