Ann: Open of Retail Entitlement Offer and dispatch of Information, page-3

Hi,
Do you mind explaining how does it work? I read the Information Booklet, soon I should receive a letter showing my unique Customer Reference Number and Bpay Biller Code (I assume that it's the same for everyone), then I simply use Bpay to transfer $ = 1.7 * (my gxy share numbers /14) * 1.33 (33% extra); and if extra (33%) is not fully available, they will transfer the remaining money back. Is my understanding correct?

Example: If I got 140000 shares, I can transfer 1.7 *10000 *1.33 = $22610
If only 20% extra share is available, 1.7 *10000 *1.20 = $20400
They will transfer (22610-20400)=2210 back to the same bank account that I used for Bpay?

This is the first time for me, much appreciated if someone can confirm my understanding is correct. Thanks!