my 11street experience
i bought a few things thru facebook login (not yet register at that time), applied the vouchers
then i register with my gmail, download the coupons as usual
for the coupons that u have used previousy, example 50% apps only discount
u can no longer apply it with your new account
same recipient should be ok, but address and phone number cannot be the same
so, use lah office address, with diff phone number
or use family member's name, diff phone number, same address
i was actually half sweating, afraid 11street verify based on credit card info, otherwise kena lor...coz the facebook "me" and the gmail "me" both have exactly same credit card details, billing address, etc...

got 11street staff in here,habislah u...