How can I delete invoices within my site?

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Recurly cannot remove any data from a production environment. For production invoices that may be in an open or past due state, you may want to stop collection on them and mark the invoices as failed to close them out. You can do this by going to the invoice page, going under Invoice Actions, then clicking on Stop Collection. If you're currently handling test data within a sandbox environment, you can remove all customer data by going under the Configuration tab on the left-hand navigation menu, visiting the Site Settings page, and clicking Clear Test Data in the top right-hand corner of the page.