Chase offers depend on the merchant name provided to chase to match or somewhat match.
PayPal may process it as a different name. I didn't pursue the
giftcards.com offer so I'm not sure how it coded but
@PoppyJ reported that it came through as Blackhawk network when going through PayPal so "Blackhawk Network" does not come close to "
GiftCards.com" hence why offer did not trigger. I can report last year it did work though as the names were close or matching. The transaction was coded as "Giftcardscom" and triggered the "
Giftcards.com" offer even though it was missing the period.
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