generating refresh token fails in self client method with error {'error': 'invalid_code'} am attaching my request details below description

url = 'https://accounts.zoho.in/oauth/v2/token'

params = {

            'grant_type': 'refresh_token',
            'client_id': 'sample_id',
            'client_secret': 'sample_secret',
            'refresh_token':'sample_refresh'
            
        }

responses = requests.post(url, params=params)

can anyone helpme

thank you in advance