Curl command into Tesla post function

I have this command that works in terminal

curl "https://api.mysite.com/protected/json/new -d "user[email]=link@hotmail.com&user[cellphone]=112334558864&user[country_code]=49

I tried a few different ways with Tesla using the post function to replicate the request. Nothing I’m trying works but this is the latest attempt

post(client, “/new”, “user[email]= link@hotmail.com&user[cellphone]=112334558864&user[country_code]=49”)

Does anyone know of the translation into Tesla for essentially posting arrays with the post function?