Where can I find the parametre list for the Completions ?

[Koenisegg484]

I am using a free version of Openai's API thus I would like to properly configure my messages so that they use lesser tokens/credits.
Where can I find the full list of parametres for the following function :
client.chat.completions.create(
messages=[
{
"role" : "user",
"content" : user_prompt,
}
],
model="gpt-3.5-turbo",
)