title: Paypal Recurring Payments IPN
body: <p>I set up an IPN inside Paypal to hit every time a Recurring Payment using Payflow Pro is set to go through. How can I make it send back the variable for the custom ID I need to make sure that I can use to extend the membership?</p>
  
  <p>So far I have tried ProfileID, payer_business_name, option_name1, rp_invoice_id, invoice, and custom, none are sent back when it goes through.</p>