title: What do the src and sra form fields for PayPal IPN HTML form do?
body: <p>Example: <a href="https://stackoverflow.com/questions/11019954/paypal-recurring-payments-form">paypal recurring payments form</a></p>
  
  <p>When I have one enabled, it changes "for one month" to "for each month" on the checkout form, so why do I need two of them?</p>
  
  <p>I've looked for the variables here and cannot find it. <a href="https://developer.paypal.com/webapps/developer/docs/classic/ipn/integration-guide/IPNandPDTVariables/#id091EB0901HT" rel="nofollow noreferrer">https://developer.paypal.com/webapps/developer/docs/classic/ipn/integration-guide/IPNandPDTVariables/#id091EB0901HT</a></p>