Aloha Stuart,
We are able to offer assitance in using the MethodAPI in the MethodAPI forums here (which is monitored by our development team), but we do not offer phone support for the API. If it is imperative you get this functionality working in Method, I would suggest you reach out to one of our Certificated Method Solution Providers (MSP's) who have experience using the MethodAPI. I have provided you a link here to a page on our Method website that will give you a list of Method Solution Providers (MSP's). When you do a search, make sure to check off the option for "I'm looking for someone who has experience with the MethodAPI".
If you are able to work with our API on your own, but have some implementation questions, they should be able to help you in this MethodAPI section of the forums. However, if you find you need some more advanced help on implementation, we have a great group of MethodAPI MSP's that I am confident would be able to assist in a solution for you.
-Ben