[winpro19]

I am having a slight problem with this...the payment goes through and everything, but I have setup so that upon purchasing a subscription, a user's usergroup changes to "Paid Members" instead of "Registered". But the thing is, the subscriptions are not going through successfully. I get the payment in Paypal, however the user does not get updated.
I checked transaction log, and this is what it states:

vb_error_code  	invalid_payment_amount
GET
method 	paypal
POST
payment_date 	17:44:23 Jul 14, 2008 PDT
txn_type 	web_accept
last_name 	blabla
residence_country 	US
item_name 	1 Month Subscription
payment_gross 	8.75
mc_currency 	USD
business 	[email]blabla@yahoo.com[/email]
payment_type 	instant
verify_sign 	AoS.E.blabla
payer_status 	verified
tax 	0.00
payer_email 	[email]blabla@hotmail.com[/email]
txn_id 	blabla
quantity 	1
receiver_email 	[email]blabla@yahoo.com[/email]
first_name 	blabla
payer_id 	blabla
receiver_id 	blabla
item_number 	blabla
payment_status 	Completed
payment_fee 	0.55
mc_fee 	0.55
shipping 	0.00
mc_gross 	8.75
custom 	username
charset 	windows-1252
notify_version 	2.4

Any fix? This is urgent for me...as I mass-emailed everyone and gave them the coupon code, but now noticed this problem =O