QASO

<?php
    // SQL Code
    $query = "INSERT INTO customer (name, email, password, contact, contactPerson, address, status, nic) VALUES (:name, :email, :password, :contact, :contactPerson, :address, 'active', :nic)";

    // PDO Prepare.
    $insertRecordStmt = $connect->prepare($query);

    // PDO Execute With SQL Injection Safe Method.
    $result = $insertRecordStmt->execute([
        'name' => $name,
        'email' => $email,
        'password' => $password,
        'contact' => $contact,
        'contactPerson' => $contactPerson,
        'address' => $address,
        'nic' => $nic,
    ]);


    // Check Result
    if ($result) {
        //Save Last Insert ID.
        $newId = $insertRecordStmt->lastInsertId();

        // Original Code
        $_SESSION['Reg_Id'] = $newId;
        $_SESSION['Reg_Name'] = $name;
        $_SESSION['Reg_Password'] = $password;
        $_SESSION['Reg_Location'] = "Home";
        $_SESSION['Reg_Type'] = "customer";

        // Always Echo your data at the end of your code.
        echo json_encode(['status' => 'success', 'message' => 'account registered']);
}

// Recommendation:
//
//      It is best pratice to store the password as a hash such as a **sha1** with salt and paper,
//      such as:
//          <?php $password_hash = hash('sha1', 'S@lT' . $password . 'P3pp3r'); ?>
//

?>