Terminology

Term	Description
Message	A Message is a single outbound message. Messages get sent to handsets via various channels, and get marked as delivered if we receive confirmation of delivery, or failed if we don't.
Batch	A Batch is a collection of one or more messages. Each message that gets sent belongs to a batch, regardless of how many messages are contained within it.
Organization	This represents your organization, interacting directly with the Messaging Plus API. Organizations have an Organization API key that is used to authenticate against accounts related endpoints.
Account	Each Organization in mplus can contain multiple Accounts. Each Account has it's own Account API key, which is used to authenticate against message sending endpoints.
Delivery Receipt	Delivery receipts are status updates we provide on a per-message basis, with information about whether the related message has delivered, or failed to deliver.
Webhook	A Webhook (usually referred to as a Webhook request) is a HTTP request we'll make to your system after a specific event has triggered. The two types of events that can trigger webhook requests in mplus are Inbound messages, and Delivery receipts
Credit	Credit used for sending messages. 1 credit is equal to 1 message part. Credits can restrict accounts from sending depending on how the account is configured
Paid credit	Credits that can be topped up, and optionally go negative to an optional negative limit. Can be configured to automatically reset to zero on a fixed schedule
Packaged credit	Credits provided as part of a "package" to a customer. Tracked separate to paid credits, and can be configured to topup on a fixed schedule. Will always be consumed before paid credits