Shoppers Flock to Online Buy Now, Pay Later Programs

outfit: 의상, 옷, 복장 
But also likes to treat himself through first class plan tickets or new outfit.

paycheck: 봉급, 월급 
You are not using your entire like say paycheck or your savings all at once.

charge interest: 이자를 청구하다
Some others may charge interest.

convert: 전환시키다
browser: (물건을 살 생각은 별로 없이 가게를) 둘러보는 사람
Websites offering these plans were able to convert a browser to a buyer.