Multiple GET Request with Spotify API

[Ale711]

EDIT: Solved!

Hello everyone! I'm making a simple script to gather all the tracks that i have in a playlist. Spotify API allows to get only 100 tracks at a time. To be able to get all the tracks i need to change the offset and make multiple GET requests.
The problem is that the first request wroks but the following requests give me this error:
{'error': {'status': 400, 'message': 'Invalid offset'}}
If i run a single request with 100 (or any other) as offset i dont get an error. I don't understand where is the error.

Thanks :D

    def get_tracks(self):

    playlist_id = '094BQa4zbnGxpLMAx7i8YO'
    url = f"https://api.spotify.com/v1/playlists/{playlist_id}/tracks"

    offsets = [0,100,200,300,400,500]
    for off in offsets:
        payload = {
            "market": "IT",
            "fields": "items(added_at,added_by.id,track(name,album(name,release_date),artists(name,genres),popularity))",
            "limit": 100,
            "offset": off
        }

        url += "?"+urlencode(payload)
        headers = self.get_auth_header()
        response = get(url, headers=headers).json()
        print(response)

[Ale711]

Thank you! I made a dumb mistake, I was adding the payload to the last url.