easypay: link your bank account to your credit card so either full or partial balance will be taken out of your bank account (usually checking account) on the due date.
For example, the statement date for my citi card is on 18th of each month and the full balance will be taken out of my bank checking account on the 12th of the next month (3 weeks after the statement date)
Thanks for the reply.
Last question: if it can be any day, how can I make sure my account have enough money to transfer?
Can I pay last month's balance manually?