Buy Now, Pay Later (BNPL) services like Klarna and Afterpay have seen explosive growth, offering interest-free installments and instant approval. Initially appearing as a consumer-friendly alternative to credit cards, BNPL leverages psychological triggers such as the "pain of paying" and "temporal discounting" to encourage impulse purchases. While seemingly free of interest, these companies profit from higher merchant fees, significant late fees (affecting one in three users), selling consumer data, and bundling loans to larger banks. This system often leads to "loan stacking," where consumers accumulate multiple small debts, often without realizing the total financial burden. Many users, especially young adults with limited financial literacy, are already in debt, and BNPL exacerbates this by creating an illusion of unlimited spending. To avoid financial traps, consumers are advised to never spend more than they currently have, treat BNPL like a debit card if unsure, and avoid stacking loans, especially for everyday expenses.