You're seeing just the callback delete_subscription, go back to EventStore module for more information.
Link to this callback

delete_subscription(stream_uuid, subscription_name, opts)

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  stream_uuid :: String.t(),
  subscription_name :: String.t(),
  opts :: options()
) :: :ok | {:error, term()}

Delete an existing persistent subscription.

  • stream_uuid is the stream the subscription is subscribed to.

  • subscription_name is used to identify the existing subscription to remove.

Returns :ok on success.