apiKey: ********************{
"voiceUrl": "https://example.com/voice.mp3",
"bgmUrl": "https://example.com/bgm.mp3",
"bgmVolume": 100
}curl --location --request POST '/api/audio/merge' \
--header 'apiKey: <api-key>' \
--header 'Content-Type: application/json' \
--data-raw '{
"voiceUrl": "https://example.com/voice.mp3",
"bgmUrl": "https://example.com/bgm.mp3",
"bgmVolume": 100
}'{
"errorMessage": "string",
"code": 0,
"aboutUrl": "string",
"traceId": "string",
"audioUrl": "/api/audio/files/processed_audio_123.mp3",
"downloadUrl": "/api/audio/download/processed_audio_123.mp3"
}