The numbers at the arrows define the sequence of the interactions

The customer does a checkout from the products he or she wants to order.
• After the customer has clicked on the Pay Now button, the customer is redirected to the Payment Workflow.
• The customer has to fill in his credit card information on the payment information page in the site.
The customer has to fill in his credit card information on the payment information page in the site.
• If the credit card seems to be valid, the customer is redirected to the next step in the checkout workflow or process.
The customer gets a summary of the order when the transaction was successful.
• Otherwise the customer is offered to checkout again.
• LoginBD.Com will send a notification about the, successful or failed, payment to LoginBD.Com
• This notification is also known as a call-back.
• LoginBD.Com relies on the call-back to approve or decline orders.