Step 1: Get Code & Install Dependencies

First, unzip the downloaded file and navigate into the project directory using your terminal. Then, run the following command to install all the necessary packages:

<code>npm install</code>

Step 2: Set Up Your Supabase Backend

This script uses Supabase for the database, authentication, and storage.

1. Go to supabase.com and create a new project.
2. In your new project, navigate to the SQL Editor.
3. Open the DATABASE_SCHEMA.sql file that came with this project.
4. Copy the entire content of the SQL file, paste it into the Supabase SQL Editor, and click "Run". This will create all the required tables and security policies.

Step 3: Configure Environment Variables

This is the most important step. In the project's root folder, rename the .env.local.example file to .env.local. Then, open it and fill in your own API keys.

<code># Get these from your Supabase Project Settings > API
NEXT_PUBLIC_SUPABASE_URL="YOUR_SUPABASE_URL_HERE"
NEXT_PUBLIC_SUPABASE_ANON_KEY="YOUR_SUPABASE_ANON_KEY_HERE"

# Get these from your Stripe, PayPal, and Razorpay Dashboards
NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY="pk_test_..."
STRIPE_SECRET_KEY="sk_test_..."
# ...and so on for other payment gateways
</code>

Step 4: Run Your Marketplace!

You're all set! Run the following command in your terminal to start the development server:

<code>npm run dev</code>

Your site will be available at http://localhost:3000.