With this online service, you can return as many unwanted items as you like.
With this online service, there is no limit to the number of items you can return
「返品し放題のサービス」= You can return as many items as you like / With this online service, you can return as many unwanted items as you like. / With this online service, there is no limit to the number of items you can return
ボキャブラリー
return = 返品する
items = 商品、買った物
as many ~ as you like = いくつでも、~放題
unwanted items = いらない商品
no limit = 限界
number of items = 商品数