OceanStor REST api authorization

Hello!

I`m trying to automate oceanstor configuration with python script and rest api.

Here is my Python code for authorization

payload = {'username':'testuser', 'password':'AaBbCc.3', 'scope':'0'}

r = requests.post('https://10.XX.XXX.XX:8088/deviceManager/rest/xxxxx/sessions', params=payload, verify=False)

When execute it I get an error

In [34]: r.text
Out[34]: '{"data":{},"error":{"code":50331651,"description":"The entered parameter is incorrect.","suggestion":"Enter a correct parameter."}}\n'

URL looks to be correct

In [33]: r.url
Out[33]: 'https://10.XX.XXX.XX:8088/deviceManager/rest/xxxxx/sessions?username=testuser&password=AaBbCc.3&scope=0'

I have no idea what is wrong. Username/Password is correct, I created it special for this test and I can log in to storage.

I would appreciate for any coments.

Thanks!