The deal I can find is, and did you buy $75 worth of goods first?
"When you find that perfect holiday gift, use your Citi card. You’ll earn a one-time $15 statement credit after you link your Citi card to PayPal and spend $75 or more on eligible PayPal purchases. In order to qualify, your purchases must post between 11/11/2019 and 12/31/2019. Remember that sometimes your card is charged when your items ship, and all charges must be posted to your statement by 12/31/2019 to qualify."