If you don't get your $5 off from paypal for ebay purchases, you just have to email them. Here is the reply I got when I emailed… Log into paypal, and email from there.
Thank you for contacting PayPal, my name is Tonia and I am happy to assist you today.
I do apologize for you not receiving the $5.00 off promo with your purchase. I have requested for a $5.00 credit to be given to you in your PayPal account balance. Please do allow up to 72 hours for this to appear.
If you have any further questions, please feel free to contact us again.
Sincerely,
Tonia
PayPal, an eBay Company
Thanks for the info!