go get github.com/lucasmdomingues/gocielo

package main

import (
	"fmt"

	"github.com/lucasmdomingues/gocielo"
)

func main() {
	
	// Merchant ID & Merchant Key
	merchant := gocielo.NewMerchant("ID", "KEY")

	// Number, Holder, Expiration Date, Brand, Security Code, Save Card
	card := gocielo.NewCreditCard("1234123412341231", "Teste Holder", "12/2030", "Visa", "123", false)

	// Amount,Installments, Soft Descriptor, Provider
	payment := gocielo.NewPayment(15700, 1, "123456789ABCD", "Simulado")

	// Sandbox, Merchant, Customer Name, Card, Payment, Order ID
	order, err := gocielo.ExecuteCreditCardPayment(true, merchant, "Comprador crédito simples", card, payment, "2014111703")
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println(order.Payment.ReturnMessage)
}