How do pass the parameter

{"error":true,"message":"required parameters are not available"}

<?php 

//getting db connection
require_once'db.php';

$response =array();

if (isset($_GET['apicall'])) {

    switch ($_GET['apicall']) {
        case 'signup':
            //signup validation

        if (isTheseParametersAvailable(array('do_name','do_bg','do_age','do_mobile','do_pincode','do_gender','do_city','do_state','do_mailid','do_password'))) {

            //getting the value  from database
            // $id=$_POST['id'];
            $do_name=$_POST['do_name'];
            $do_bg=$_POST['do_bg'];
            $do_age=$_POST['do_age'];
            $do_mobile=$_POST['do_mobile'];
            $do_pincode=$_POST['do_pincode'];
            $do_gender=$_POST['do_gender'];
            $do_city=$_POST['do_city'];
            $do_state=$_POST['do_state'];
            $do_mailid=$_POST['do_mailid'];
            $do_password=md5($_POST['do_password']);


//as the email and username should be unique for every user 
             $stmt = $conn->prepare("SELECT do_name FROM users WHERE do_name = ? OR do_mailid = ?");
 $stmt->bind_param("ss", $do_name, $do_mailid);
 $stmt->execute();
 $stmt->store_result();
            //user already exist

            if ($stmt->nom_rows>0 ){

            $response['error']=true;
            $response['message']='User Already Register';

            $stmt->close();
                
            }else{

                //insert query
                $stmt=$conn->prepare("INSERT INTO users(do_name,do_age,do_bg,do_mobile,do_pincode,do_gender,do_city,do_state,do_mailid,do_password) VALUE (?,?,?,?,?,?,?,?)");
                $stmt->bind_param('ssssssss',$do_name,$do_age,$do_gender,$do_mailid,$do_state,$do_city,$do_bg,$do_pincode,$do_mobile);


                if($stmt->execute()){
                     //fetching the user back 
 $stmt = $conn->prepare("SELECT do_name,do_age,do_bg,do_mobile,do_pincode,do_gender,do_city,do_state,do_mailid,do_password FROM users WHERE do_name = ?"); 
 $stmt->bind_param("s",$do_name);
 $stmt->execute();
 $stmt->bind_result($id,$do_name,$do_age,$do_gender,$do_mailid,$do_state,$do_city,$do_bg,$do_pincode,$do_mobile,$do_password);
 $stmt->fetch();
 
 $user = array(
 'id'=>$id, 
 'do_name'=>$do_name,
 'do_age'=>$do_age,
 'do_gender'=>$do_gender,
 'do_mailid'=>$do_mailid,
 'do_state'=>$do_state,
 'do_city'=>$do_city,
 'do_bg'=> $do_bg,
 'do_pincode'=>$do_pincode,
 'do_mobile'=>$do_mobile,
 'do_password'=>$do_password
 
 );

        $stmt->close();
 
 $response['error'] = false; 
 $response['message'] = 'User registered successfully'; 
 $response['user'] = $user; 
 }
 }
 
 }else{
 $response['error'] = true; 
 $response['message'] = 'required parameters are not available'; 
 }
            break;
   



        case 'login':
 
 if(isTheseParametersAvailable(array('do_name', 'do_password'))){
 
 $do_name = $_POST['do_name'];
 $do_password = md5($_POST['do_password']); 
 
 $stmt = $conn->prepare("SELECT  do_name,do_age,do_bg,do_mobile,do_pincode,do_gender,do_city,do_state,do_mailid  FROM users WHERE do_name = ? AND do_password = ?");
 $stmt->bind_param("ss",$do_name, $do_password);
 
 $stmt->execute();
 
 $stmt->store_result();
 
 if($stmt->num_rows > 0){
 
 $stmt->bind_result( $id,$do_name,$do_age,$do_gender,$do_mailid,$do_state,$do_city,$do_bg,$do_pincode,$do_mobile,$do_password);
 $stmt->fetch();
 
 $user = array(
 'id'=>$id, 
 'do_name'=>$do_name,
 'do_age'=>$do_age,
 'do_gender'=>$do_gender,
 'do_mailid'=>$do_mailid,
 'do_state'=>$do_state,
 'do_city'=>$do_city,
 'do_bg'=> $do_bg,
 'do_pincode'=>$do_pincode,
 'do_mobile'=>$do_mobile,
 'do_password'=>$do_password
 );
 
 $response['error'] = false; 
 $response['message'] = 'Login successfull'; 
 $response['user'] = $user; 
 }else{
 $response['error'] = false; 
 $response['message'] = 'Invalid username or password';
 }
 }
 break; 
 
 default: 
 $response['error'] = true; 
 $response['message'] = 'Invalid Operation Called';
 }
 
 }else{
 $response['error'] = true; 
 $response['message'] = 'Invalid API Call';
 }
echo json_encode($response);

function isTheseParametersAvailable($params){
 
 foreach($params as $param){
 if(!isset($_POST[$param])){
 return false; 
 }
 }
 return true; 
 }

 ?>