I am not sure if this one has been mentioned or suggested. If it has, I apologize.
Maybe this can't be done with PayPal.
I think of jsp as a subscription based service provider. I pay 10$usd a month for the perks and to support the site not for the fg.
If this is even possible without drawing up too much room for malicious activity or fraud etc. which is why I presume PayPal is the safe-bet.
The notification is nice to receive, but sometimes I go AFK for a few days and pm inbox could fill up. I could set a reminder and so forth, but this is a QOL upgrade!