Affirm Holdings shares rose 7% on Friday after the buy now, pay later company reported fiscal fourth-quarter revenue of $1.17 billion, exceeding the $1.11 billion LSEG estimate, and issued a stronger-than-expected fiscal first-quarter outlook. Affirm forecast first-quarter revenue of $1.19 billion to $1.22 billion, above the Street expectation of $1.16 billion, while gross merchandise volume reached $14.1 billion, surpassing the $13.39 billion StreetAccount estimate. CEO Max Levchin told CNBC that elevated fuel costs are weighing on U.S. consumers, who are using Affirm to manage spending amid inflation. The national average gasoline price was $4.09 per gallon on Friday, down from above $4.50 in May but still above pre-Iran war levels; it was last below $3 on March 2. Levchin said consumers remain generally healthy but warned that sustained price pressure could be harmful over the long term. Annual inflation was 3.7% in July, while the PCE price index, the Federal Reserve's preferred inflation gauge, rose a seasonally adjusted 0.2%. Personal income increased 0.4% and spending rose 0.2%, both stronger than expected. The figures are weighing on the Federal Reserve and Chairman Kevin Warsh ahead of their next policy decision at a September meeting.