Grimfall

[AnghelescuG]

Hello. I try to "hack" the Grimfall app. More info .
So, the app uses http traffic. The responses are in JSON, but the requests are encoded. Header says: Content-Type: application/x-www-form-urlencoded; charset=UTF-8, but no success for me. Exemple of requests:

PWQqUmZ4HAQcZFheXl9FQlURFxsLbwEaGw8uJ01bQlxjCBR2VDIvNVNqDExHWSFTWV5DGWFTQVtQWiQfdlZbKiVYR0JKb1VTTHowIzFALSdaExxkQkxDUFpBFAlWG00oXF1EWSIvSREXCXUCBAwEdXJyDnZ2Gx0SNVdeQlhYXF5SXlEbexMOU0kge18DFFklBgZdBHBycFMnJhlTAXVWSwMHAVAEAA9ERA==

PWQqUmZ4HAccZFheXl9FQlURFxsLbwEaGw8uJ01bQlxjCBR5RTYqKlUlNkReXmh/TEEfZFdERURaXG98WUcDJCdNfE9SJFFCSxdqZDNXNiNAQhJ8SQ9FWFpXRUdMVEljCwkDHXF2CAAZCnMHAwEZZDUmRTcrQl9YJ0FFEwsVBFJXTgBfcQhZUxlzJwgFGQskUVIMV3d1J1B2dBtTAnUQARNcVkpOERcIDXEdGlpMOzsbCRwKcR4UT1o0KidbJTJcRFU1Rg8LRUVHUx8PVFAvSRoNFXNuG15EVjgQDA4FamQiQCU2TENvL1YPCwkDA0tO