Returns a URL that the end-user must visit to consent to Account Data and/or Payment Initiation operations. This API can only be called when instructed by a 1426 error code;
it is not used to initiate consent. Whether the end-user consents or fails to consent, the flow will redirect to either a Neonomics URL or a custom redirect URL.
To enable a custom redirect, include the x-redirect-url parameter in the request header. The callback will then include a resource_id (the session-id) and a result
(the request's status, either OK or FAILED). Note that x-psu-ip-address is required for Swedish Banks and Handelsbanken Finland.