I had a look into Shop and Buy. About $330 p/m with 3x integrations and the trademe API through traderunner is free anyway. I'm going to try that, custom APIs are difficult to maintain and expensive unless you have a great coder. So probably about the same price as tradevine + custom API anyway.Tradevine is fantastic software but unless tradevine is going to support us using their service it's better to go to a more progressive provider