subscription button explained a bit

[Web Global Net]

 <input type="hidden" name="cmd" value="_xclick-subscriptions">
    <input type="hidden" name="business" value="info@internet.com">
    <input type="hidden" name="item_name" value="Alumni Reunion Ticket 3 month Installment Plan">
    <input type="hidden" name="item_number" value="3 19">
    <input type="hidden" name="no_shipping" value="1">
      <input type="hidden" name="return" value="http://manager.net/class_members/registration.php?class_id=5341">
    <input type="hidden" name="image_url" value="http://alumni.org/assets/paypalhhLetter.png ">
    <input type="hidden" name="no_note" value="1">
    <input type="hidden" name="currency_code" value="USD">
    <input type="hidden" name="lc" value="US">
    <input type="hidden" name="bn" value="PP-SubscriptionsBF">
    <input type="hidden" name="a3" value="19.00">
    <input type="hidden" name="p3" value="1">
    <input type="hidden" name="t3" value="M">
    <input type="hidden" name="src" value="1">
    <input type="hidden" name="sra" value="3">
    <input type="hidden" name="srt" value="3">


These are the main setting that control the subscription

  <input type="hidden" name="p3" value="1">
    <input type="hidden" name="t3" value="M">
    <input type="hidden" name="src" value="1">
    <input type="hidden" name="sra" value="3">
<input type="hidden" name="srt" value="3">
Red controls how often the subscription occurs - i.e. if set to 4 the subscription will be paid every 4 months.

Green t3 - controls the frequency M= equals Monthly - D=Daily - W=Weekly Y=Yearly

Navy sr - controls how many payments will be made - if set to 1 will occur until user cancels

Purple srt - control how many times the payment will happen - ie. if set to 3 then there will be 3 payment