Examine source code of DiscCard Integration

{
  "manifest_version": 3,
  "name": "DiscCard Integration",
  "version": "1.0.3",
  "description": "Chrome extension to integrate DiscCard in your POS system",
  "browser_specific_settings": {
    "gecko": {
      "id": "lightspeedIntegration@disccardpromos.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://api.disccardpromos.com/*"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://us.merchantos.com/register.php*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "options_page": "options.html"
}