This page answers frequently asked questions about Sign in with Klarna in PrestaShop, including button visibility, authentication errors, redirect configuration, and returned customer data.
Use this page when the Sign in with Klarna button does not appear or when authentication does not behave as expected.
Visibility
These FAQs cover cases where the Sign in with Klarna button does not render.
Why is the Sign in with Klarna button not appearing?
This usually happens when:
- Redirect URL is not configured in Klarna Merchant Portal
- Required OAuth scopes are missing
- Allowed origins are not set
- The feature is not enabled in the module
- The theme overrides the login template
Authentication issues
These FAQs cover issues where the Klarna login flow opens but does not complete.
Why does Sign in with Klarna return an authentication error?
The most common reasons include:
- Incorrect redirect URL
- Missing scopes such as email, phone, or name
- Domain mismatch between your store and the Merchant Portal configuration
Why am I redirected to the wrong page after login?
Check the redirect URL configured in the Merchant Portal. It must match exactly the URL provided in your PrestaShop module’s documentation.
Returned customer data
These FAQs cover situations where the customer logs in successfully but information is missing.
Why is some customer information missing after login?
Klarna can only provide the information allowed by the active scopes and explicitly approved by the customer. If a scope such as email is not enabled, Klarna cannot return that detail.