Add a filter expression in a channel member that’s associated with a custom channel. The channel member associates a custom platform event with the channel and specifies the filter expression. The channel holds the filtered stream of event messages that match the filter expression for the specified custom platform event.
Let’s walk through the steps to create a channel, a channel member, and a filter expression. Then we can subscribe to the channel to validate receiving the filtered event stream.
Prerequisite: Define a Platform Event
The examples in this section depend on a predefined custom platform event called Order_Event__e. To define this event in Salesforce, complete these steps.
Before you can add a filter, create a channel. Use PlatformEventChannel in Tooling API, and specify API version 56.0 or later.
Add a Filter with Metadata API
We recommend using Metadata API as part of the application lifecycle management process to develop, test, deploy, and release your apps to production. If you want to create the channel and filter expression, we recommend that you use Tooling API with REST.
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