Don't know about kinguin but many sites use Paypal along with other payment options. G2A is what I use mostly and they also have other payment methods. Paypal is simply one of the method.
As for them being same company, don't know why but same games under same category and options (region lock, etc) cost different on G2A and Kinguin. Either way, most of the time they provide games at way cheaper than Steam.
I used to think retail games were cheaper until I met Steam sales. But now I met G2A and finding it with few other sites even cheaper than Steam. WOOT!
Thanks for the heads-up. Yeah I go there everyday to see deals. Comparing G2A to Steam sales is a good way to save money imo.
So far I never had any trouble with G2A as even w/o their G2A Shield (charging a buck and half most of the time) I would get my key to work 100% of the time.
The question is: Does Kinguin provide a better price than G2A? Also it's confusing to search their site (at least for me) as they tend to put price in Euro.
Not sure about other sites' overall qualities, but G2A seems to sell games at least few bucks cheaper than the other sites. Also they are pretty good and I've purchased a lot from them w/o any hassle.