# Models

## The Externallink object

```json
{"openapi":"3.0.1","info":{"title":"Flow","version":"1.1.0"},"components":{"schemas":{"Externallink":{"required":["result"],"type":"object","properties":{"result":{"type":"string","description":"Used to evaluate success or failure in Flow and can be any value you wish to return for evaluation"},"reference":{"type":"string","description":"A unique hash generated by Flow based on SessionID and SourceID that allows us to identify the user's session. This value is automatically appended as a query parameter on external links and should be intercepted and returned with the callback for validation (in header and body): e.g. `https://www.example.com?reference=f7_4hn5=8f&%#nK=`"},"data":{"type":"object","additionalProperties":{"type":"string"},"description":"An optional hashmap with any key and value that can be referenced in the flow later on."}}}}}}
```

## The Waitforcallback object

```json
{"openapi":"3.0.1","info":{"title":"Flow","version":"1.1.0"},"components":{"schemas":{"Waitforcallback":{"type":"object"}}}}
```


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