do you think lose i money from popular websites?

hello, could you help me to know that, i just found online store website and paypal payment is available on it but they are popular by Alexa with a ranking for 4 years, there are technical and administrative contacts are free one. Does it look risky to buy from them?
thank you.

Since we have no idea WHAT online store you're talking about, we can't tell you whether we think it's safe or not.

Do a WHOIS search on the domain. If it's less than a year old, or if it's based in China, do not order from them. You will be scammed.