Revvin does not have an app in the Zapier directory. Use Webhooks by Zapier with the endpoint and API key shown in the Integrations tab. When your software reports a completed job, Revvin schedules the same automatic email ask as the Job done tab.
Jobs are marked done by hand in your dashboard, and every personal referral ask goes out from your own phone or email app, so it always comes from you: Revvin prepares the message and opens your own app with the recipients and the text filled in. Reactivation campaigns work the other way round, and are the one thing Revvin sends for you, by email only, from your Pro account, with an unsubscribe link in every message.
If an integration matters to how you work, email info@revvin.co and it will be factored into what gets built next. In the meantime the how-it-works page describes exactly what Revvin does today.