This depends on the retailer or merchant you make your purchase from.
If your item is due to be shipped straight away, you will usually make your first payment at the same time that you make your purchase.
If your item is due to be shipped at a later date, your first payment will be when your item is shipped.
Subsequent monthly payments are always taken on the same date as your first payment and this date cannot be changed.
In addition to your monthly payments, we will hold (authorize) the full outstanding purchase amount as a guarantee for future payments. This authorization is not charged as long as your plan is kept up to date.
Authorisations for the full outstanding amount are renewed periodically and decrease with each installment payment made.
The previous authorisation is automatically removed as soon as a new one is obtained. You can find more details here.