Shipstation adapats slowest. I only use it because it simply works, otherwise no feature addition for the growth of their customers. This is a badly required feature, not too complicated either.
@Moderator-Davis When do you expect the feature of storing serial #'s to be enabled? On my end, there is a significant change that could possibly drive us to opt for a different provider. We currently do 700 to 2,500 packages per day. Please advise. Thank you!