<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def validate(self):
 """Validate the user and token, returns the Requests response."""


        validate_url = "https://api.pushover.net/1/users/validate.json"

        payload = {
            'token': self.api_token,
            'user': self.user,
        }

        return requests.post(validate_url, data=payload)