WOO authorisation / permissions error

Invalid signature - provided signature does not match / Sorry, you cannot list resources.
Error Ugyldig signatur - oppgitt signatur samsvarer ikke / Beklager, du kan ikke liste ressurser.

Linked2 uses the OAuth standard to authenticate your WooCommerce API key & secret. A pre-requisite for this to work is you must be using >=WordPress 4.4 and this plugin by the WordPress REST API team must be installed & enabled: