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"To complete a transaction, customers receive a voucher stating the amount to pay for services or goods. Customers then pay the boleto before its expiration date, in one of several different methods, including at authorized agencies or banks, ATMs, or online bank portals."

https://stripe.com/docs/payments/boleto

"The Boleto Bancário is an official and popular payment method in Brazil. This voucher payment can be used in two ways. When the consumer receives the voucher at the checkout, he can print it and pay it in cash at more than 200 thousand payment locations, or it can be paid electronically through internet banking."

https://business.ebanx.com/en/brazil/payment-methods/boleto-...

"Reach a huge part of the Latin American population with voucher payments
Whether by cultural preference or need, voucher payments are extremely popular in LatAm."

https://business.ebanx.com/en/latin-america/payment-methods/...

In this website, they use the word "voucher" several times to explain how boletos work.

https://www.adyen.com/payment-methods/boleto-bancario

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