Contact::makeAgent method does not work correctly

[Galyam]

Contact::makeAgent method does not work correctly
{"message":"GET method is not allowed. It should be one of these method(s): PUT"}

[mpclarkson]

Any chance you can submit a PR @Galyam ? This is a pretty simple fix.

[blocklogic-au]

@mpclarkson

Have submitted a PR, but its now giving me the following error.
{"code":"invalid_json","message":"Request body has invalid json format"}

Happy to push a new PR, but no idea how to fix this.

Thanks
Ben

[blocklogic-au]

@mpclarkson @Galyam

My Pull request now has valid data for the PUT request, and is succeeding on my testing