There are a few options to install the Merx plugin.
Merx does not have any special requirements. If Kirby 3 is running fine, Merx also will be fine.
Installation as Git submodule
Run the following command on your website’s root and Merx and it’s dependencies are installed at
git submodule add https://github.com/wagnerwagner/merx.git site/plugins/merx
Read more about Kirby and Git on getkirby.com
Installation via Composer
If you prefer composer you can add Merx with this command from your website’s root. This will install Merx and it’s dependencies at
composer require wagnerwagner/merx
Read more about Composer and Kirby on getkirby.com
It is ideal for new users to explore many of Merx’s possibilities. If you want to create a simple store fast, this would also be a good option for you. If you want to use PayPal and/or Stripe (Credit card, SEPA Direct Debit, Klarna) with the Starterkit you have to create and add the respective keys.