Your integration may add custom parameters. The tables only list parameters that exist in Synerise and SDKs/APIs by default.
## landingpage.visit A visit to the landing page. This event is generated even without a tracking code on the landing page. **Default retention**: 30 days | Parameter | Type | Example | Description | | --- | --- | --- | --- | | Base parameters | various | n/a | [Parameters that may exist in all events](/docs/assets/events/event-reference/common-parameters#base-parameters) | | id | string | `c8f0b875-62e9-4dae-b9d5-241cbc9453b3` | Unique ID of the campaign | | campaignName | string | `Black Friday promotions` | Name of the communication campaign | | userAgent | string | `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko)` | Information about the User Agent | ## landingpage.renderFail A landing page couldn't be generated. This event is generated even without a tracking code on the landing page. **Default retention**: 30 days | Parameter | Type | Example | Description | | --- | --- | --- | --- | | Base parameters | various | n/a | [Parameters that may exist in all events](/docs/assets/events/event-reference/common-parameters#base-parameters) | | id | string | `c8f0b875-62e9-4dae-b9d5-241cbc9453b3` | Unique ID of the campaign | | campaignName | string | `Black Friday promotions` | Name of the communication campaign | | userAgent | string | `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko)` | Information about the User Agent | | error | string | `Jinjava syntax error` | Cause of render failure of the landing page | | info | string | `Jinja rendering terminated by user` | Error message from the [`terminate`](/developers/inserts/insert-usage#stopping-communication-from-rendering) insert |