How is a bank card form implemented in the most popular eCommerce websites in Brazil?

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Website Rank * Bank Card Form
mercadolivre.com.br 9 t/4065
magazineluiza.com.br 99 t/4068
Walmart Brazil 107 t/4071
ricardoeletro.com.br 272 t/4070
fastshop.com.br 614 t/4069
fnac.com.br 1614 t/4067

* Alexa Rank in Brazil