SigningHub is an online document signing service. Users can upload docs to the service, prepare them for signatures, review and then sign them. SigningHub also offers an API that allows developers to integrate e-signature functionality into their own websites and apps. The API allows for adding users, uploading documents, defining a workflow and tracking documents. It uses RESTful calls and responses are formatted in XML.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.