Using Flow Service component Message Actions with Flow
This type of Flow Service Operation is used to map to Message Actions in a Message step in Flow.
A message step can be added to a Flow in order to send and receive message requests between Flow and the Integration Flow Service.
Message actions are used by a Flow to define the interface of inputs/outputs when calling against your Flow Service Message Actions, allowing you to map values in a Flow to the inputs and outputs specified by your Flow Service.
Message actions are useful if the request/response data passed between Integration and Flow are in different formats, for example if passing a selected date range from a Flow into an API endpoint, in order to receive back stock price data.
When you import or update an Integration connector in Flow, Flow creates actions that you can access through a Message step.
For example:

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An Integration process named 'Retrieve' is assigned to a Flow Service component Message Action.
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A 'Retrieve CRM record' Message step is added to the Flow canvas, and a new Message Action is added to this step. Refer to Adding Message Actions to a step.
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The Boomi Integration Service connector is selected as The connector to send the Message.
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The available Actions in The Message to send table are then populated with the Flow Service Message Actions set up in Integration.
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The Action can be configured by selecting the relevant value in Flow to use for each Input/Output parameter.
The Input and Output values passed to and from Message Actions are named and configured using the Request and Response profiles assigned to your Integration process.