The following are the specified steps to complete an order via e-commerce portals.
Firstly, the customer must need an account in the specified e-commerce site. while sign up we must need to fill out your basic information including name, contact number, e-mail for an identity.
Add products to cart
If the customer is interested in a specific product you should pin that product to your cart.
Fill out your shipping address
Now, he is decided to buy that product, so he should fill out the proper delivery address.
Add your payment details
Then he needs to complete his payment of that particular cart item. Using debit/credit card, mobile banking etc..
Before the payment, he should have to confirm the order.