Can't get User Access Token and invalid_grant error

[mehde-3902]

I was able to get "code" using client_id and redirect_uri successfully. But when I try to use this "code" while sending request to "authorization_code" endpoint I got error below.

Error:

{'error': 'invalid_grant', 'error_description': 'the provided authorization grant code is invalid or was issued to another client'}

Here is the python script;

import urllib.parse
import requests
import base64

if __name__ == '__main__':
    codes = input("Enter code:").strip()
    codes = urllib.parse.unquote(codes)    
    client_id = "XXXXXX"
    client_secret = "XXXXXX"
    exhange_end_point = "https://api.ebay.com/identity/v1/oauth2/token"
    ci_cs = f"{client_secret}:{client_secret}"
    encoded_ci_cs = ci_cs.encode()
    b64_ci_cs = base64.b64encode(encoded_ci_cs).decode()
    headers = {
        "Content-Type"  : "application/x-www-form-urlencoded",
        "Authorization" : "Basic " + b64_ci_cs
    }
    data = {
        "grant_type" : "authorization_code",
        "code" : codes,
        "redirect_uri" : "XXXXXXX"
    }
    resp = requests.post(exhange_end_point, headers= headers, data = data)

    print(resp.json())