払い込む

はらいこむ · haraikomu · JLPT N2 · verb-godan

to pay in

🏦 払う (pay) + 込む (put inward) = pay money inward into a bank account

込む means to go or put inward, as in 書き込む (write in). Pay plus inward gives paying money into an account, which is the core sense of 払い込む.