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You can get a Client App Id and a Primary and Secondary API Token under Settings > Client Apps in Studio.
Authorization = APIToken [CLIENTAPPID]:[APPAUTHTOKEN]
Or
Authorization = APIToken 1243F889051245E123476B45D761E041:C8PHDB39cAdAuVtU/m0nPIN7wXfgZZoz4+JQDtINP2bYxvx7PpLuwvA2UEDNaLGDnuNOEWUhS/YxXzxN9s7E1AP==