how to convert GET method to POST method in cURL in PHP?

Dear Experts,
I use PHP, I need to get a token from a link using below information.
I did that with GET method with below code but I need to do that with POST method
How can I do that? Thank you

Method : POST
Authorization  Type : oauth2
Grant Type : password
Content-Type : application/x-www-form-urlencoded
RequestUrl :xxxxxxxxxxx
URL: https://www.api-url-here.com/auth-function-here


Service Input Parameters:

username as string
password as string
client_Id as string

Service Return Parameters:

access_token as string
token_type as string
expires_in as string

thank you in advance.

//Initialize cURL.
$ch = curl_init();
 
//Set the URL that you want to GET by using the CURLOPT_URL option.
curl_setopt($ch, CURLOPT_URL, 'https://www.api-url-here.com/auth-function-here?grant_type=password&username=MickeyMouse&password=letmein&client_id=00001');

curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));
 
//Set CURLOPT_RETURNTRANSFER so that the content is returned as a variable.
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 
//Set CURLOPT_FOLLOWLOCATION to true to follow redirects.
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
 
//Execute the request.
$return = curl_exec($ch);
 
//Close the cURL handle.
curl_close($ch);
 
//Print the data out onto the page.
$data = json_decode($return);

var_dump ($data);

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