The error :

{"message":"Invalid Request Signature parameter (request_sig) (Root=1-66f7bd09-3319a7625c7c62c96eca1150)","code":400,"status":"error"}

what is the solution for this ?

https://www.qobuz.com/api.json/0.2/oauth2/login?username=<U>&password=<P>&app_id=681647177&request_ts=<TIME>&request_sig=e28e9f3d71d274a605693111477d4fe2

how to find there request signature ?