7.3

Replyable Event Topics
Some event topics support replies from the subscribed service. The service that registered the replyable
event topic can accept a reply event that provides the workow output, usually as a result of an interaction
with a system or user. The reply output parameters must meet the criteria dened in the reply schema so
that the vRealize Automation service that published the original replyable event can process it. For example,
pre-approval and post-approval workow subscriptions are replyable. If you create a workow that sends
an approval request to an external system, the reply, approved or rejected, is processed by
vRealize Automation and the catalog item is provisioned or the user is notied that the request was rejected.
The reply can be the output from the vRealize Orchestrator workow or it can be a failure if the workow
times out or fails. If the reply is from the workow output parameters, the reply must be in the correct reply
schema format.
Best Practices for Creating vRealize Orchestrator Workflows for Workflow
Subscriptions
A workow subscription is based on a specic topic schema. To ensure that the subscriptions can start the
vRealize Orchestrator workows, you must congure them with the correct input parameters so that they
work with the event data.
Workflow Input Parameters
The custom workow that you create can include all the parameters or a single parameter that consumes all
the data in the payload.
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To include individual parameters, congure one or more parameters. Ensure that the name and type
match the name and type specied in the schema.
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To use a single parameter, congure one parameter with a type of Properties. You can provide any
useful name. For example, you can use payload as the parameter name.
Workflow Output Parameters
The custom workow that you create can include output parameters that are relevant to subsequent events
necessary for a reply event topic type.
If an event topic expects a reply, the workow output parameters must match the reply schema.
Workflow Subscription Settings
The subscription options determine when a workow runs based on event messages in
vRealize Automation. Use the options to manage your subscriptions.
A subscription represents a user's intent to subscribe to events for a given event topic and to run a workow
when an event for the topic is received that matches dened conditions.
You must be a tenant administrator to create a workow subscription. All workow subscriptions are
specic to your tenant.
To manage your workow subscriptions, select Administration > Events > Subscriptions.
Life Cycle Extensibility
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