如何使用Spotify API向播放列表批量添加歌曲？

我在调用Spotify API向播放列表批量添加歌曲时遇到了问题，目前的实现代码如下：

def add_selected_songs(songs, playlist_id):
        ACCESS_TOKEN = input('Provide Access Token: ')

        request_data = json.dumps(songs)
        URL = f'https://api.spotify.com/v1/playlists/{playlist_id}/tracks'
        response = requests.post(
                URL,
                data=request_data,
                headers={
                    "Content-Type": "application/json",
                    "Authorization": f"Bearer {ACCESS_TOKEN}"
                })  
        response_json = response.json()
        return response_json

其中songs变量是从另一个播放列表获取的歌曲URI数组，格式示例如下：

['spotify:track:75s1b4uRCk6UPOPBLNdDIA', 'spotify:track:3hqJdqziOPbu422kXaOyII', 'spotify:track:6rdKHwxWa9aqWyoGf1r20v', 'spotify:track:6xQdHOX1Tq3IrKsQdLs0nc', 'spotify:track:66g4mn8jSks0Hu1zEcc81G']

我怀疑问题出在URI的处理或者requests.post()的调用方式上，我对JSON和Spotify API的了解不多，都是从YouTube视频学的。目前我能正常获取播放列表信息，也能单独添加单首歌曲，但批量添加就是不成功，希望有人能帮我找出问题所在！

编辑：
感谢大家的反馈，我修改了代码，现在版本如下：

def add_selected_songs(songs, playlist_id):
ACCESS_TOKEN = input('Provide Access Token: ')

songList = '%2C'.join(songs)
while(songList.find(':') != -1):
    songList = songList.replace(':','%3A')

URL = BASE_URL + f'/playlists/{playlist_id}/tracks?uris={songList}' #之前居然忘了加uris参数，哈哈
response = requests.post(
        URL,
        headers={
            "Accept": "application/json",
            "Content-Type": "application/json",
            "Authorization": f"Bearer {ACCESS_TOKEN}"
        })  
response_json = response.json()
return response_json

内容的提问来源于stack exchange，提问作者Grace Metri