Understand the wording we use.

Access tokenA JSON Web Token used to grant access to APIs.
AccountContains contact and billing information, and one or more API Spaces.
API SpaceA partition of the platform, containing isolated configuration and data. May also have isolated processing.
App messagingApp or web based two-way messaging.
App userThe end user interacting with a client SDK.
ChannelChannel or route to which a message is delivered, for example, SMS, app messaging, Facebook.
ConversationRelated, ordered set of messages with an ID and specific set of participants.
InboxThe ability to send push and content into an inbox inside a customer’s app or web site.
Formerly known as Donky.
Messaging APIThe messaging component of the Enterprise Communications API, providing a unified messaging API able to send to any configured Channel, including SMS, Messaging, Inbox, and Facebook Messenger.
ParticipantSomeone involved in a Conversation.  May be an app user or a platform user.
Platform UserBelongs to an account.  Can log in to the portal and perform permitted actions.
ProfileInformation related to a particular app user or platform user.  Can contain custom data and can also be used to access message history.
RulesRules which define the platform functionality, for example, which channel should be used to deliver a message.