> For the complete documentation index, see [llms.txt](https://developer.paddle.com/llms.txt).

# Simulation runs

Notification simulation run entities describe an attempt by Paddle to send simulated events for a notification simulation.

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You can use [webhook simulator](https://developer.paddle.com/webhooks/test-webhooks.md) to create reusable configurations that you can use for testing webhooks, like simulating all events that occur when a subscription is created.

A notification simulation run is an attempt by Paddle to send simulated events for a [notification simulation](https://developer.paddle.com/api-reference/notification-simulations.md).

Paddle creates a notification simulation run when you play a notification simulation initially, and each time you replay a notification simulation

Notification simulation runs contain:

- What kind of simulation was run.
- When the run happened.
- Whether the run completed successfully.
- A list of simulated events that occurred as part of this run.