Gift card

Im gonna assume youre playing on the US servers so you probably created an US I-tunes or an US google play account, if so then you have to buy a US Giftcard for either google play or i-tunes and charge the account you used to download the game with it. then Log into that account and buy the SQ

You could try this.

http://loadcentral.com.ph/googleplay_itunes/

You could also try downloading the PayMaya app which is a virtual debit card. You could use this card to buy SQ.