This endpoint enables the Pliant web app and mobile app access for the given cardholder and converts the cardholder from an API-only (embedded) cardholder to a non-embedded cardholder. The cardholder will then be able to access the Pliant web app and mobile app. Cardholders upgraded this way will receive an email to set a password (when they have not been non-embedded in another organization before) or to log in with their existing password and accept the terms and conditions (in case they have already been a non-embedded member of another organization). This endpoint is relevant mainly for embedded partnerships where you want to grant selected cardholders access to the Pliant apps. To revoke app access again, use the Remove Pliant App Access endpoint.