ошибка requests, post запрос

Question

import requests

params = {"phone": "998946282712", "name": "magnatik", "group": 2472}

reqston = requests.post("https://smstel.ru/api/create/contact?key=1dddad9226dd4f4fd4018afc4022457b6c715e87", params=params)
print(reqston.text)

Ошибка: {"status":400,"message":"Invalid Request","data":false}