Easy integration with our existing system which makes it very easy for us as we don't have much experience in integrating third party systems into ours - they just work! The support team are also really helpful so that's always nice when there isn’t an option of live chat or phone call you can easily escalate things if needed without being too pushy about doing something else first i guess? We haven;'ts had any issues yet but I know others use other providers who do sometimes report some problems once during their contract period (although this may be because those companies aren"T perfect either). Our customers love how simple everything has become since using postman compared from having another 3rd parties ship management service like Shipworks etc where managing orders was quite complicated before now its all super intuitive thanks!!