I've done sample codes sir. I just do not have a idea of how to combine everything. Especially in the payment code. When it comes hardware part.
How do i code like this ? to rfid parts?
int main ()
int card=100, reload, amount=0;
printf("Your bal. %d\n\n", amount);
printf("%d reloaded\n", reload);
printf(" Your card is %d", amount);