Money paid for IPO under ASBA in someone else

As per the new ASBA rules, a person can apply for shares in a IPO on behalf of  5 persons.

How will the accounting for the payment be made in the books of the parties.

I am giving an example:

A applies for the shares worth 2 lakhs in name of B with all details of B only including his demat account number.

The Bank withholds 2 lakhs from A's Bank account till the shares are alotted & when the shares are alloted, that much amount is debited to A's Bank account & the balance amount is released for utilization

Shares for 15,000 are alloted to B by the company & the shares are credited directly by the Registrar to the demat account of B & the bank account of A is debited by15,000

B gets the shares & pays 15,000 to A + 250/- as interest for utilising his money for the IPO period

How will the entries be passed in the books of accounts of both A & B and also how will the confirmation be made

Thanks for advising