paypal express checkout

We are US based store. PayPal worked till May. Since May, I have few hundred abandoned carts and not even a single sale through PayPal. I checked with 2 of my PayPal accounts. PayPal charge. PayPal charge customers account as unclaimed. However they receive messages that they successfully paid...

Anybody using this Paypal Express checkout option in alidropship new update? Is it good idea to use? Because with this option customer cannot able to add coupons and if they order then may be we cannot get full address details (May be). If anyone using or used this option then please share...