Sports fans face an anxious wait to see which, if any, Olympic tickets they have got and how much money they will have to pay.
A London 2012 spokesman said 'most payments will be taken out by tonight' but they are still working towards a June 10 deadline to collect all payments.
Even then, would-be buyers will be told what they have successfully won by 24 June.
Initial card payments are due to be debited by the end of 31 May for cards that went through first time, according to the organisers.
Outstanding payments from successful applicants whose cards failed the first time around for a range of reasons are now being taken.
These may be Visa cards that have been declined because they have been lost or stolen since the application was made.
New Visa card details may need to be registered with Ticketmaster customer services team by a specified date so payment can be taken.
The organisers are contacting successful applicants whose Visa cards have failed in order to give them more time to move funds into their accounts to cover the total cost of their application by a specified date.
In total, 1.8 million people have made 20 million requests for tickets - but only 6.6 million tickets are on sale in Britain.
This has resulted in over-subscriptions for more than 50% of the 650 sessions, which has triggered computerised ballots.
A London 2012 spokesman said: 'Applicants who have been unsuccessful and have got nothing in the first round will get priority in the second round.
'The reality is that many people will not be lucky the first time around but they will get priority for the second round.
'There have been 20 million applications for tickets and many events have been oversubscribed, so there will be some people who will not get any in the first round but they will get something in the second round.'
They will get details of how to apply when they are notified if they have been successful by 24 June.
