curl --request POST \
  --url https://api.sunoapi.org/api/v1/generate/upload-extend \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "uploadUrl": "https://storage.example.com/upload",
  "defaultParamFlag": true,
  "model": "V4_5ALL",
  "callBackUrl": "https://api.example.com/callback",
  "instrumental": false,
  "prompt": "Extend the music with more relaxing notes",
  "style": "Classical",
  "title": "Peaceful Piano Extended",
  "continueAt": 60,
  "personaId": "persona_123",
  "personaModel": "style_persona",
  "negativeTags": "Relaxing Piano",
  "vocalGender": "m",
  "styleWeight": 0.65,
  "weirdnessConstraint": 0.65,
  "audioWeight": 0.65
}
'

import requests

url = "https://api.sunoapi.org/api/v1/generate/upload-extend"

payload = {
    "uploadUrl": "https://storage.example.com/upload",
    "defaultParamFlag": True,
    "model": "V4_5ALL",
    "callBackUrl": "https://api.example.com/callback",
    "instrumental": False,
    "prompt": "Extend the music with more relaxing notes",
    "style": "Classical",
    "title": "Peaceful Piano Extended",
    "continueAt": 60,
    "personaId": "persona_123",
    "personaModel": "style_persona",
    "negativeTags": "Relaxing Piano",
    "vocalGender": "m",
    "styleWeight": 0.65,
    "weirdnessConstraint": 0.65,
    "audioWeight": 0.65
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    uploadUrl: 'https://storage.example.com/upload',
    defaultParamFlag: true,
    model: 'V4_5ALL',
    callBackUrl: 'https://api.example.com/callback',
    instrumental: false,
    prompt: 'Extend the music with more relaxing notes',
    style: 'Classical',
    title: 'Peaceful Piano Extended',
    continueAt: 60,
    personaId: 'persona_123',
    personaModel: 'style_persona',
    negativeTags: 'Relaxing Piano',
    vocalGender: 'm',
    styleWeight: 0.65,
    weirdnessConstraint: 0.65,
    audioWeight: 0.65
  })
};

fetch('https://api.sunoapi.org/api/v1/generate/upload-extend', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.sunoapi.org/api/v1/generate/upload-extend",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'uploadUrl' => 'https://storage.example.com/upload',
    'defaultParamFlag' => true,
    'model' => 'V4_5ALL',
    'callBackUrl' => 'https://api.example.com/callback',
    'instrumental' => false,
    'prompt' => 'Extend the music with more relaxing notes',
    'style' => 'Classical',
    'title' => 'Peaceful Piano Extended',
    'continueAt' => 60,
    'personaId' => 'persona_123',
    'personaModel' => 'style_persona',
    'negativeTags' => 'Relaxing Piano',
    'vocalGender' => 'm',
    'styleWeight' => 0.65,
    'weirdnessConstraint' => 0.65,
    'audioWeight' => 0.65
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.sunoapi.org/api/v1/generate/upload-extend"

	payload := strings.NewReader("{\n  \"uploadUrl\": \"https://storage.example.com/upload\",\n  \"defaultParamFlag\": true,\n  \"model\": \"V4_5ALL\",\n  \"callBackUrl\": \"https://api.example.com/callback\",\n  \"instrumental\": false,\n  \"prompt\": \"Extend the music with more relaxing notes\",\n  \"style\": \"Classical\",\n  \"title\": \"Peaceful Piano Extended\",\n  \"continueAt\": 60,\n  \"personaId\": \"persona_123\",\n  \"personaModel\": \"style_persona\",\n  \"negativeTags\": \"Relaxing Piano\",\n  \"vocalGender\": \"m\",\n  \"styleWeight\": 0.65,\n  \"weirdnessConstraint\": 0.65,\n  \"audioWeight\": 0.65\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.sunoapi.org/api/v1/generate/upload-extend")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"uploadUrl\": \"https://storage.example.com/upload\",\n  \"defaultParamFlag\": true,\n  \"model\": \"V4_5ALL\",\n  \"callBackUrl\": \"https://api.example.com/callback\",\n  \"instrumental\": false,\n  \"prompt\": \"Extend the music with more relaxing notes\",\n  \"style\": \"Classical\",\n  \"title\": \"Peaceful Piano Extended\",\n  \"continueAt\": 60,\n  \"personaId\": \"persona_123\",\n  \"personaModel\": \"style_persona\",\n  \"negativeTags\": \"Relaxing Piano\",\n  \"vocalGender\": \"m\",\n  \"styleWeight\": 0.65,\n  \"weirdnessConstraint\": 0.65,\n  \"audioWeight\": 0.65\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.sunoapi.org/api/v1/generate/upload-extend")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"uploadUrl\": \"https://storage.example.com/upload\",\n  \"defaultParamFlag\": true,\n  \"model\": \"V4_5ALL\",\n  \"callBackUrl\": \"https://api.example.com/callback\",\n  \"instrumental\": false,\n  \"prompt\": \"Extend the music with more relaxing notes\",\n  \"style\": \"Classical\",\n  \"title\": \"Peaceful Piano Extended\",\n  \"continueAt\": 60,\n  \"personaId\": \"persona_123\",\n  \"personaModel\": \"style_persona\",\n  \"negativeTags\": \"Relaxing Piano\",\n  \"vocalGender\": \"m\",\n  \"styleWeight\": 0.65,\n  \"weirdnessConstraint\": 0.65,\n  \"audioWeight\": 0.65\n}"

response = http.request(request)
puts response.read_body

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "5c79****be8e"
  }
}