メルカリの外部の後払い決済サービスを悪用した不正行為が発生確認してください。

危険度マックスですね。
https://jp-news.mercari.com/2020/01/15/news/
Check to see if fraudulent misuse of Mercari’s external post-payment service has occurred.
It’s a risk max.

メルカリで商品を購入したら家電量販店からも二重に請求が
後払いサービス『Paidy』を悪用した詐欺がフリマアプリで多発中
https://togetter.com/li/1455404

If you buy a product with Mercari, you will be charged twice from electronics retailers
Fraud abuse of postpaid service “Paidy” is occurring frequently with Flea Market app

このような窃盗手順
paidyの登録に必要なのは出品者(詐欺師)の電話番号とメールアドレス
詐欺師がpaidyの支払い請求をバックれると、
落札者の名前と住所宛にpaidyから商品代金請求書が届く
(詐欺師は被害者から事前に代金受取して逃げる)というスキーム

Such a theft procedure
All you need to register for paidy is the phone number and email address of the seller (scammer)
If the scammer can back the payy bill,
The product price invoice will be sent from payy to the name and address of the winning bidder
(The scammer receives payment from the victim in advance and escapes)