Tested and wworks

1. Online Store → Themes → Customize
2. Open a product template → Add block (or section) → Custom Liquid
3. Paste → Save

1. In the editor: Add (+) → Embed Code → Embed HTML
2. Choose Code, paste, then Update
3. Drag the box to size — keep it square

1. Edit the page → Add block → Code
2. Paste, keep the mode on HTML → Save
3. Code blocks need a Squarespace plan that allows custom code

1. In the block editor: + → Custom HTML
2. Paste → Update (on a WooCommerce product, paste it into the description)

Marketplaces don’t accept embed codes. Post the Retro Card as a photo and put your GOT3D link where they allow one (bio, profile, message).