Hi guys, there are three ways to do it...

1. Create a thank you page for each product so that when people order they get taken to a unique page, with a unique aweber form on it, and where you ask the new customer to enter their name and email address. Whether they are on your list or not, this action will add whatever tags you add to the form to the new, or existing subscriber, and will trigger the campaign. This works really well. the only issue is that if someone closes their window before being redirected, or Paypal screws up the redirect, they never get added to the list. This requires you to monitor things and make sure everyone is getting their music.

2. Create a unique list for each product and then use the Paypal integration steps shown in MMM. Create a rule to apply tag upon subscription. This also works really well, and there is no issue with people closing the page or needing to take the additional step of adding their email again. However, it means many lists in time. That said, having many lists is not too much trouble. When sending broadcasts in the future you can just tick all of their respective boxes and add all of your different lists to each broadcast. The only negative here is that it means you need to send out one broadcast to your main list and one email to all of your customer lists, grouped together. This is necessary because you should only be broadcasting to people on your main list that signed up long enough ago that they are not still actively in your follow up series. If you grouped all of your customer lists into broadcast to the main list, that same rule would carry over to the customer list and recent customers would not receive the email.

3. You can hire a developer to create a script that interfaces with Aweber's API to pass tags based on what product is ordered. I have done this for clients, and it works, but it;s very fragile, and can break.

I find #2 to be the lesser of all evils.

Hope that all makes sense.