{
    "token": "1234567",
    "fileName": "xxxxxx.png"
}curl --location --request POST '/public-api/download/custom-channel-file' \
--header 'Content-Type: application/json' \
--data-raw '{
    "token": "1234567",
    "fileName": "xxxxxx.png"
}'{
    "result": "string",
    "response": "string"
}