It's simple but not easy at all! The customer service isn't as great either when there is an issue that needs attention - which can be quite frequent in my experience (we are sending hundreds of thousands per month) so it takes longer than expected sometimes even if they do have your package ready before any issues arise!! Also I believe our account was hacked once because we kept getting charged twice every time one item came into stock; this resulted in us losing money through duplicate shipments since only 1 would ever come out each week and then get refunded via bank transfer instead by them paying double what normally should've been paid initially? They never bothered contacting me about anything until after several months had passed where many orders were processed without problems resulting eventually having lost revenue due too duplicated shipping charges being deducted multiple times from customers accounts; just make sure everything works properly first otherwise things will fall apart soon enough.