You can use a activation section in your software that will be stored in the database the default value will be 0 when they register change it to 1.

Now in the software section before any function starts check for activation if it is 0 for that particular user then kill the program by displaying a message to register and if it is 1 then grant all access.

This is the simple way to do there are many other ways.

Hope this helps.

If you want more help then just let me know

Warrior Plus allows for key generation. It pings a script you create which prints the key and includes it in the user's receipt. But You'll need to keep the key generation script private. Here's an example of one:

<?php


//++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++
// INSERT DATABASE CODE HERE
//++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++

//conect to database
//set up your database connect variables
$hostname = "localhost"; //usually localhost
$database = "databasename"; //name of database
$username = "databaseusernamehere"; //database username
$password = "userpasswordhere"; //username's password


//code to connect to database
$conn = mysql_pconnect($hostname, $username, $password) or trigger_error(mysql_error(),E_USER_ERROR);
@mysql_select_db($database) or die( "Unable to select database");

//define table name that holds keys
$tablename = "wptt_licensed_users"; //if you alter the table name that holds the rss items, then change it here.

//++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++
// BEGIN SCRIPT SETUP
//++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++

$referrer= $_SERVER['HTTP_REFERER'];


//define table name that holds keys
$tablename = "wptt_licensed_users";

//generate the license key for sending to paypal
$secret_phrase ="somesecretstring0123456789";
$key = str_shuffle($secret_phrase);
$key = substr($key, 0, 20);



//CREATE LICENSE KEY
//below we perform two queries, but we really only need one. Feel free to consolidate!
$query = "INSERT INTO $tablename (`license_key`) VALUES ('$key')";
$result = mysql_query($query);
//if (!$result){ echo "$query"; }


//SET INITIAL PERMISSIONS
$query = "UPDATE $tablename SET status=1, count=count+1, channel='wso', permissions='1.1.1.1.1.1.1' WHERE license_key='$key' ";
$result = mysql_query($query);
if (!$result){ echo $query; echo mysql_error(); exit; }

//return the key so Warrior Plus can read it and provide it to the user.
echo $key;


?>

what you can do is a php file
that before the client pay the software
he will register, so the email will be in your data base and after the user pay
you redirect them to activate the software
basically they will just log in with their email
and maybe a key generated randomly
with the dowload link
so in you software connect to the database
and if the email and the key match
you allow them to use the software
if it doesn't match you send them to the sales page
its very simple

Another possibility is PHPMyLicense which is great licensing system thats really easy to use. It can encode and license your scripts to a specific domain. It also has a built in shopping cart and creates a license for a customer automatically on checkout.

We use it for our own software products some of which are very expensive and we need protected at all costs. Its also great for time limited product trials and everything can be automated.

You can find out more here: PHPMyLicense Licensing System

I do hope this helps,

Mike

I was in the same situation as you and was doing everything manually - it was fine to start with as only a few orders were coming in (I make bots for beer money), but as the bots I made seemed to work a lot more orders started to come in.

I now do everything automatically as suggested above. I have a IPN script that gets the ping back from PayPal, checks a few custom parameters and then adds the transaction ID to a database.

The script then sends an email with their license number attached. They type that into the bot and when they run it, the bot checks home to a license server. If everything checks out then it runs otherwise the bot stops and they are asked to contact support.

You can make it as simple or as complicated as you need to, but as long as you understand how it works you will be fine