ContributionsMost RecentMost LikesSolutionsRe: Custom API freight integration Hi, we've integrated with a couple for a few different clients. We always do a post from sales order or shipping or even quotes in Advanced. As far as complex code is concerned, one of them was fairly complex and used a dll we wrote for all the webservice stuff and a screen customisation to add a buton and extra tab for the shipping costs, connote etc. If you do it from shipping then you can use the built in dimensions for length, height, weight etc. the choice of where is really upto the workflow requirements rather than ease of where to put it. There's no real need to use your own dll if you dont want to, but you might find it easier if you have issues with debugging Advanced.