The RESTful Contacts API can be used to store, modify and request address book information. Users can create contact resources and assign them to group resources. Group resources can be used in the Messaging API for sending SMS and MMS messages to groups. Responses can be in XML and JSON format.
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.