JSFiddle - React, Tailwind, and code Playground

HTML

<div>
            <input type="radio" id="boleto" name="forma" value="boleto" />
            <label for="boleto">Boleto</label>
        </div>
        <div>
            <input type="radio" id="cartao" name="forma" value="cartao" checked="checked" />
            <label for="cartao">Cart&atilde;o de cr&eacute;dito</label>
        </div>    

<a id="createBillAndOrderForm:createBillAndOrder" href="#" rel="{&quot;category&quot;: &quot;ckout&quot;, &quot;action&quot;: &quot;Click Fechar Pedido&quot;, &quot;label&quot;: &quot;Boleto&quot;, &quot;value&quot;: 804.00}" title="Finalizar Compra com Boleto Banc&aacute;rio" onclick="var a=function(){showLoader('bill'); doLoadingPayment();};var b=function(){if(typeof jsfcljs == 'function'){jsfcljs(document.getElementById('createBillAndOrderForm'),{'createBillAndOrderForm:createBillAndOrder':'createBillAndOrderForm:createBillAndOrder'},'');}return false};return (a()==false) ? false : b();" class="btnStandard buyNow dataGaEvent btnPagto btnBoleto" style="display: none;">
                                Finalizar Compra com Boleto Banc&aacute;rio</a>

<a id="paymentGroups:0:creditForm:checkout" href="#" rel="{&quot;category&quot;: &quot;ckout&quot;, &quot;action&quot;: &quot;Click Fechar Pedido&quot;, &quot;label&quot;: &quot;Cart&atilde;o de Cr&eacute;dito&quot;, &quot;value&quot;: 804.00}" onclick="var a=function(){showLoader('credit-card'); doLoadingPayment();};var b=function(){if(typeof jsfcljs == 'function'){jsfcljs(document.getElementById('paymentGroups:0:creditForm'),{'paymentGroups:0:creditForm:checkout':'paymentGroups:0:creditForm:checkout'},'');}return false};return (a()==false) ? false : b();" class="btnStandard buyNow dataGaEvent btnPagto btnCartao" style="display: none;">
    Finalizar Compra com Cart&atilde;o de Cr&eacute;dito</a>

JavaScript

$("input[name='forma']").change(function() {
    var meio = $("input[name='forma']:checked").val();
    displayPaymentButton(meio);
});

function displayPaymentButton(meio) {
    $('.btnPagto').hide();
    $('.btn' + capitaliseFirstLetter(meio)).show();
};

function capitaliseFirstLetter(string) {
    return string.charAt(0).toUpperCase() + string.slice(1);
}