attachments

POST attachments/delete — This method is used to delete attachments. A single attachment can be deleted through this method
POST attachments/add — This method is used to add attachments on an existing entity. This Web API method requires a multipart/form-data post, as defined in RFC 1867. There are many libraries available that can be used in order to submit multipart/form-data posts (for example MultipartEntity http://hc.apache.org/httpcomponents-client-ga/httpmime/apidocs/org/apache/http/entity/mime/MultipartEntity.html in Java). A single attachment can be added through each call
GET attachments/list — This method returns the attachments related with a specific entity. Multiple attachments are returned by each call.