I've seen in previous discussions that you are planning this feature
Barcodes scanning and storing are already part of the ATUM App beta. We'll add some more features (like codes auto-generation, etc) before we release it publicly. On the ATUM WP side, we'll add the fields for it soon, so they can be read/written from the WP side, just that.
Could you share with me the name of the product meta attribute (for example: _atum_product_gtin), so that I can begin to plan the product sync script?
This field in ATUM WP isn't going to be a meta key. We plan to add it in the same way as all the other ATUM product fields (within a column in the wp_atum_product_data table).
Also, it's very important for us to be able to search for products in stock central using GTIN. Are you considering this feature?
Searching by barcodes is already available within the App. We'll consider adding it to ATUM WP's Stock Central but don't have an ETA for that at this time.