post
POST /oauth2/token HTTP/1.1
Host: 
Content-Type: application/x-www-form-urlencoded
Accept: */*
Content-Length: 84

"grant_type='text'&username='text'&password='password'&refresh_token='text'"
{
  "access_token": "text",
  "token_type": "text",
  "expires_in": 1,
  "refresh_token": "text",
  "refresh_token_days": 1
}