Planetskinz is a website, that compares prices of skins. Skins are visual changes of your character, objects, guns or other things. Instead of buying expensive skins in the Steam marketplace, you can compare the price of several marketplaces to find the best price.
Planetskinz just compares prices. You just pass on the user to the marketplaces.
No, everything works without registration.
You have to register with your Steam account in the markterplaces. Afterwards you can buy your wanted product. The bots of the marketplaces send you a tradeoffer. Just accept the trade offer and the skin is in your inventory.
Buying skins on a marketplace is absolutly legal
Many shops offer several paymentmethods. Usually all shops have Paypal, Paysafecard, credicard or banktransfer.
Don't worry, all marketplaces are verifed by Planetskinz. Every marketplace got a very nice support. If you have problems with your order, contact the support of the marketplace. If you still have any problems, feel free to contact us.