Customer is asked to fill this on the shopping cart page if the date is less than 30 days from today then they carry on to complete transaction. And a message is displayed under the delivery date, this message is set in the admin panel.
If the date is more than 31 days then they only pay 25% percent (this value is defined in the admin panel) This should be reflected in backend and invoice.
For Example if the basket value is $100
Then on checkout they only pay $25
and this will be displayed as
Advance payment $25
Balance remaining $75
Also needs to not allow delivery dates in certain ranges, ranges can be set from admin.
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