In regards to the payment, you will receive 2 receipts with orders that have been applied free delivery fee and 3 receipts with orders that are applied delivery fee.
In these 3 receipts, one is the cost of the products you purchase, one is the delivery fee that your bank holds before you complete your order and the rest receipt is the total cost of your order.
When you finish your order (including delivery fee), it will show a receipt of the total. Do not worry, only the amount of money from the last receipt is deducted from your bank account.