package main import ( "fmt" ) func main() { coba := new(CreditCard) ProcessPayment(coba,100) } type PaymentMethod interface{ Pay(amount float64) } type CreditCard struct{} func (cc CreditCard) Pay(amount float64){ fmt.Println("Pay with CC...") } func ProcessPayment(method PaymentMethod, amount float64){ fmt.Println("Processing...") method.Pay(amount) }