Outbound Messaging
Outbound messaging allows you to specify that changes to fields within Salesforce can cause messages with field values to be sent to designated external servers.
Outbound messaging is part of the workflow rule functionality in Salesforce. Workflow rules watch for specific kinds of field changes and trigger automatic Salesforce actions, such as sending email alerts, creating task records, or sending an outbound message.
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A single SOAP message can include up to 100 notifications. Each notification contains the object ID and a reference to the associated sObject data. If the information in the object changes after the notification is queued but before it’s sent, only the latest data is delivered and not the intermediate changes.