Using standard WooCommerce actions and hooks (more reading here), you can customize the location to display the Klarna placement, by using these filters:
As of version 1.3.0 of the OSM plugin, shortcodes (more reading here) can be used to display placements.
The shortcode [onsite_messaging] uses the following attributes:
- data-theme (optional)
- data-purchase-amount (optional)
More information on data-key and theme can be found on the Configuration Settings page.
WordPress Widgets (more reading here) can also be used to add Klarna placements to your store.
In Appearance ⇒ Widgets, drag a Klarna On-Site Messaging widget to the desired location, then choose a Title, Placement Key, and Placement Theme.