square.onVendorUpdated subscribes to vendor.updated for the selected seller. It requires VENDOR_READ.
Example
automations/square-on-vendor-updated.automation.ts
Event
Published when a vendor is updated by calling UpdateVendor or BulkUpdateVendors , as well as using the Square Dashboard. The signal resolves to the officialSquare.VendorUpdatedEvent payload with type narrowed to vendor.updated.