sumwerk

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API referenceAuthentication, reading MRR, movements and customers, writing customers, notes, tasks and emails, events, automations and signed webhooks. With example calls and responses.
Sandboxes in sumwerk: one per system or developer, without touching your numbersA sumwerk account can have several sandboxes: copies with the same team and settings, their own data and their own API tokens (swk_test_). One for staging, one per developer. Connect Stripe's test mode, try automations. No email leaves them.
Real-time MRR: add a Stripe webhook to sumwerk (optional)sumwerk reads Stripe every hour. Add a webhook endpoint in your Stripe dashboard and changes to subscriptions and invoices show in your MRR within about a minute. Set-up in three steps.
Ask Claude about your customers (MCP)Connect Claude to sumwerk over the Model Context Protocol and ask about MRR, churn, segments, single customers and tasks in plain language. Setup in two minutes.
Connect Plain: support conversations on the customer timelineConnect Plain to sumwerk so that support conversations show on each customer's timeline and can trigger automations, and show MRR, risk and owner inside Plain next to a thread.
Send from your own Google mailboxSet up a Google Workspace app for sumwerk in ten minutes, so that emails to customers come from your own addresses. Send-only, no Google review.
Email templates, sequences and unsubscribingHow email works in sumwerk - templates with merge fields, single emails, sequences with waits, automations that send, and the unsubscribe link in every email.

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