amazon.co.uk Ads.txt file
# ads.txt
#
# Amazon's TAG-ID is 4582cc3fa09ce42f.
#
# Amazon programmatic inventory is not available for purchase through non-Amazon
# sellers or resellers; therefore, there are no authorized sellers or resellers
# listed in this file. The following "placeholder" record is the standard method
# for informing crawlers of the same:
placeholder.example.com, placeholder, DIRECT, placeholder