Go to the product of your choice and click on "Add to cart". Then click on "Order" and enter your details. Click on "Continue" and choose your preferred carrier and click on "continue" and choose your preferred payment method. Then click on "Check order" and finally on "Complete order". You will be automatically redirected to the payment page. When you click on "Complete order", you will receive an email confirming the order. When the payment is completed, you will receive an email with the invoice.