メルカリワンクリックポスト is a Chrome extension that allows users to easily issue shipping labels through the Click-Post service. With this extension, users can automatically generate Click-Post labels directly from the transaction page on the Mercari platform. All it requires is the input of the item name, and the extension takes care of the rest by automatically submitting the application.

To use the extension, users can start by setting up their Yahoo ID and the CVC (3-digit) code of their main card linked to their Yahoo Wallet. Although not mandatory, this step allows for faster and automated input.

Once the extension is installed, opening the transaction page on the PC version of Mercari will automatically display the Click-Post label generation screen. Users can easily input the item name, and with a simple click of the "クリックポスト発行" (Generate Click-Post) button, the application process is streamlined.

Please note that Click-Post only supports credit card payments through Yahoo Wallet. Users will need to have a Yahoo account with their main credit card registered in Yahoo Wallet.