params form the query string in the URL,
r = requests.post(url, headers=headers, params=param, verify=False)
data is used to fill the body of a request (together with files).
r = requests.post(url, headers=headers, data=param, verify=False)
GET and HEAD requests have no body.
For the majority of servers accepting a POST request,
the data is expected to be passed in as the request body.