I would like to stop promotional emails from clogging my main inbox but I also want to keep a close eye on the receipts so don't want them to end up in a folder I don't check very often.
You can turn off the promotional emails in your notifications setting. If the email address for the promotions come from same PayPal email address every time, use that email address to filter them to a different folder in gmail. The email address where the receipt come from will be or should be a different one and won't be affected.
