Node red Http post to get access token for Smappee

Hi,

I want to connect to smappee via api but I need to first create an access token via an http post request

This is the info they gave

Use your application’s credentials and the user’s credentials to retrieve an access token by sending a HTTP POST message to https://app1pub.smappee.net/dev/v1/oauth2/token

POST /dev/v3/oauth2/token HTTP/1.1
Host: app1pub.smappee.net
Content-Type: application/x-www-form-urlencoded;charset=UTF-8

grant_type=password&
client_id=[YOUR_APP_ID]&
client_secret=[YOUR_CLIENT_SECRET]&
username=[USER_NAME]&
password=[USER_PASSWORD]