<!-- Identifies/Updates An Existing User/Member (when/if applicable)  -->
<input type="hidden" name="on0" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_ON0; ?>" />
<input type="hidden" name="os0" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_OS0; ?>" />
<!-- Identifies The Customer's IP Address For Tracking -->
<input type="hidden" name="on1" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_ON1; ?>" />
<input type="hidden" name="os1" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_OS1; ?>" />
<!-- Controls Modify Behavior At PayPal® Checkout -->
<input type="hidden" name="modify" value="0" />

---- s2member Shortcode Equivalents ----

[s2Get constant="S2MEMBER_CURRENT_USER_VALUE_FOR_PP_ON0" /]
[s2Get constant="S2MEMBER_CURRENT_USER_VALUE_FOR_PP_OS0" /]

[s2Get constant="S2MEMBER_CURRENT_USER_VALUE_FOR_PP_ON1" /]
[s2Get constant="S2MEMBER_CURRENT_USER_VALUE_FOR_PP_OS1" /]