Invalid grant trying to get refresh token

[lubernar]

Hello, 

I want to catch changes that have been made in a spreadsheet in Dropbox by checking every 5 minutes.

I am using python and I tried this code:

url = f'https://www.dropbox.com/oauth2/authorize?client_id={APP_KEY}&' \

f'response_type=code&token_access_type=offline'

Here I copy the code displayed on the webpage. This is my ACCESS_CODE_GENERATED.

Ant then I type:

BASIC_AUTH = base64.b64encode(f'{APP_KEY}:{APP_SECRET}'.encode())

headers = {

'Authorization': f"Basic {BASIC_AUTH}",

'Content-Type': 'application/x-www-form-urlencoded',

}

data = f'code={ACCESS_CODE_GENERATED}&grant_type=authorization_code'

response = requests.post('https://api.dropboxapi.com/oauth2/token',

data=data,

auth=(APP_KEY, APP_SECRET))

print(json.dumps(json.loads(response.text), indent=2))

And the output I get is 

{ "error": "invalid_grant", "error_description": "code doesn't exist or has expired" }

I don't understand what is not working.

I would appreciate any help, thanks

[Здравко]

Hi @lubernar,

First of all, how long take between access code getting and using it? 🧐 This code is for single use only and is short lived 10~15mins. It sounds like, you kept it too long before usage.

Next thing, not signaled yet is usage of multiple basic authorizations at the same time (2 ways of all possible while 1 is needed and enough). By the way why you don't use the official Dropbox Python SDK? It would be easier. 😉

Good luck.