Suggest you get (if you don't already have) a Paypal account, and only use this for payment. It's about the easiest and safest way to get payment. Be honest when describing the phone. Allow a sensible amount (but not excessive) for p&p.
OnePlus 5 review
Alice Saey's mesmerising animation for Dutch singer Mark Lotterman
iPad Pro 10.5in (2017) review
Comment booster votre iPhone ?