Thank you for reaching out to the Shopify community forums for help! I understand you need to know your store's unique ID. This information is only accessible by our live support channels as it is your store's unique identifier on our platform.
While we're not able to provide that kind of account-specific support via the Shopify Community, we'd be happy to continue assisting you through live chat, email, or callback. To contact our live support please follow this link: Shopify Help Center - Contact Support, sign into your store account, search for your issue and use the contact support button at the bottom of the search results to see all our live support options.
hi @Calmby - Klarna Merchant support should be able to help you based on your Shopify store's unique domain (which you can provide by copying the URL in your browser from your Shopify store admin). Hope that helps!
When you log into admin panel, take a look at the URL portion of the site. It should look something as below:
The subdomain portion (example_store_id) is your Shopify's store id.