Namespaces

Check if your org has a namespace. If it does, include the namespace in every REST call you make. Only Developer Edition orgs can have namespaces. If you’re not using a DE org, you don’t have to use an org namespace in your REST requests.
  1. Enter Package in the Quick Find box or select Create | Packages from Setup.
  2. Look at the Namespace Prefix value on the Packages page. If the namespace is set, use that name in your REST calls.