All eligible SKUs in your inventory are opted into the Invoice by Amazon programme upon enrolment by default. The Invoice By Amazon SKU Management File allows you to opt out specific SKUs in your inventory from the Invoice by Amazon programme. Additionally, you can also use this file to opt back in SKUs that were opted out of the programme previously. The file is not marketplace-specific and will opt-out/opt-in SKUs across all marketplaces in which the Invoice by Amazon programme is supported (currently UK, DE, FR, IT and ES)
You can download the latest version of the file from the Inventory File Templates Help page.
The uploaded file must be populated with the SKU field and the isIBA field, which indicates whether you want to opt out or opt in the SKU.