I’m having trouble deleting Meta Data when uploading to WooCommerce?
If you have Meta Data associated with a WooCommerce record, such as a Customer, Product or Order and you wish to delete this from WooCommerce you must clear out the values for the Meta Data and upload that to WooCommerce and pass a null value. You cannot delete the Meta Data records in fmEcommerce Link and upload that to WooCommerce as it will not delete the Meta Data that exists; furthermore you cannot delete all existing Meta Data by simply uploading an empty array like this:
"meta_data" : ,
Just make sure you delete the Key and Value field values in FileMaker – make sure you leave the WooCommerce Meta Data ID – and it will clear these from WooCommerce on your next upload.