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Mercur is built as a set of Medusa plugins, ready to be pulled from NPM and installed in your project. If you want to modify or add new features to Mercur, you don’t want to use prebuilt packages, but set up a development version. Step 1: Fork Mercur Fork Mercur Step 2: Clone forked repository 
git clone https://github.com/<YOUR-USERNAME>/<MERCUR-REPO>
Step 3: Install dependencies and build 
cd <MERCUR-REPO>
yarn install
yarn build
Step 4: Configure environment variables 
cd apps/backend
cp .env.template .env
Now, fill the newly created .env file with your variables. Step 5: Create database, migrate, and create admin account 
npx medusa db:create
npx medusa db:migrate
npx medusa user --email [email protected] --password secret
Optionally: run yarn seed to fill database with example data
Step 6: Start the application (from the /apps/backend directory!) 
yarn dev
Now you are ready! Please note that if you make any changes to one of the plugins, you have to rebuild it before it is loaded into Mercur. To do that, navigate to the plugin directory and run the yarn build command. Optionally, you can run yarn dev in both the plugin directory and the backend app—all the changes will be built automatically, and the backend will restart. More on plugins: Medusa Plugin Docs