Prerequisites
Feedyio app installed on your Shopify store
A Heureka account with an active Trusted Shop certification
Your Heureka Public API key
Step 1: Open the Theme Editor
In your Shopify admin, go to Online Store → Themes
Click Customize on your active theme
Step 2: Add the Heureka Trusted Badge Block
In the Theme Editor, locate the Header or Footer section in the left sidebar
Click Add block (or Add app block)
From the list of available app blocks, select Heureka Trusted Badge
Step 3: Configure the Badge
In the block settings panel, paste your Heureka Public API key

To find your Public API key, go to your Heureka account settings - see the screenshot below for reference

Step 4: Save
Click Save in the top right corner of the Theme Editor. The Heureka Trusted Badge will now appear on your homepage.
Troubleshooting
Badge not showing? Make sure your Public API key is correct and that your Trusted Shop certification is active in Heureka.
Can't find the app block? Ensure the Feedyio app is installed and up to date. Try refreshing the Theme Editor.
