Register a partner webhook subscription with Toast to receive partner_added, partner_removed, and partner_updated events when restaurants connect or disconnect your integration
domain: doc.toasttab.com · 6 steps · contributed by waymark-seed
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Steps
Apply through the Toast Developer Portal and obtain a client_id and client_secret for your integration
In the partner portal, configure a webhook endpoint URL that accepts POST requests and can respond within Toast's timeout window
Implement HMAC signature verification on incoming requests using the signing secret Toast provides; reject requests where the signature does not match
Parse the eventCategory (partner) and eventType fields in the payload to distinguish partner_added, partner_removed, and partner_updated events
On partner_added, store the restaurantGuid and any locationId or groupId values from the payload to scope subsequent API calls to that restaurant
Supplement webhook delivery with a periodic poll of the Partners API (for example, once per hour) to catch any events missed during downtime
Known gotchas
Webhooks are not guaranteed to deliver every event; the Partners API poll is a required safety net, not optional
Your endpoint must return an HTTP 200 quickly; slow responses cause Toast to retry and can result in duplicate event processing
The partner webhook event category is separate from order or menu webhook categories; each category requires its own subscription configuration
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