curl --location --request POST 'https://api.kie.ai/api/v1/generate/extend' \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data-raw '{
"defaultParamFlag": true,
"audioId": "e231****-****-****-****-****8cadc7dc",
"prompt": "用更多放松的音符和一个柔和的过渡段延长音乐",
"style": "Classical",
"title": "Peaceful Piano Extended",
"continueAt": 60,
"model": "V4",
"callBackUrl": "https://api.example.com/callback",
"negativeTags": "重金属, 快节奏鼓点",
"vocalGender": "m",
"styleWeight": 0.65,
"weirdnessConstraint": 0.65,
"audioWeight": 0.65,
"personaId": "persona_123"
}'