I've been considering buying the $30 Garena prepaid cards because when converting, I get bonus RP. But earlier I had a match and I casually asked in chat about how much RP bonus you can get buying the $30 card instead of the $10 card. Someone said his friend used his credit card to buy RP instead, and instead of the supposed 960 RP, he gets 1000 RP so a +40 RP bonus.
I didn't see how to use a credit card to buy RP though. I see that you can buy Garena points with a credit card, but I don't know if any savings would actually happen when you convert to RP instead of just buying the $30 cards.
Personally I rather not use my credit card, but just wondering if there really is a bonus amount of RP and how much is it (to me right now that +40 RP isn't really worth it to me to use a credit card to buy instead of prepaids).