If you want to verify your marketplace using Google Search Console (GSC) (previously named Google Webmaster Tools or GWT), you can do it by adding Google's verification code as a custom script to your marketplace.
Add your website at Google Search Console
Log in to GSC with your Google account at https://www.google.com/webmasters/tools/ and follow the instructions to configure your website.
When asked to choose a verification method, chose "HTML tag" in the URL prefix option. Copy the tag that is displayed. It looks something like this:
<meta name="google-site-verification" content="fjXvx4lEjsk876gksçKjgç0sjg99WwzB3QFldg8yCfkj1u4h61ej7C50drQI"/>
Add the GWT verification tag to your marketplace
Open the "Advanced / Custom script" page from your Sharetribe Admin panel.
Paste the copied verification tag into the "Custom head code" field.
Click "Verify" in Google Search Console. That's it! Your marketplace is now verified with the Google Webmaster Tool.
Add the sitemap
In Google Search Console, go to Sitemaps from the menu on the left.
Click on "Enter sitemap URL" field under "Add a new sitemap."
Enter sitemap.xml.gz and hit Submit.
That's it! Google now knows about your sitemap file and will index its content over time.
More information about GWT and custom scripts
You can learn more about Google Search Console from Google support.
You can learn more about custom scripts in Sharetribe from this article.