Capture Custom Value

#1

I have a custom form using stripe on a page
[s2Member-Pro-Stripe-Form level="*" ccaps=“spotlight” desc=“Spotlight Membership” cc=“USD” custom=“dev.firesuite.net|spotlight” ra=“50.00” rp=“1” rt=“L” rr=“BN” coupon="" accept_coupons=“0” default_country_code=“US” captcha=“0” /]

NOTICE custom=“dev.firesuite.net|spotlight”

i want to capture that value in s2-payment-notification.php in the MU plugin

if $userID = $_GET[‘subscriberID’]; is the user ID
how do i get that custom value ?

here is my api scripting
http://dev.firesuite.net/sandiegobirthnetwork/?s2_payment_notification=yes&subscriberID=%%user_id%%&%%cv1%%

#2

nevermind…
i just used the description also the massive use of %% signs threw it off.

i still dont know how to retrieve the cv1 fields but a step in the right direction is to actually make a query string:
?cv1=%%cv1%%
as opposed to
?%%cv1%%