# StartBpmnInstanceByMessage
## Properties
**flow_input** | Option<[**std::collections::HashMap<String, serde_json::Value>**](serde_json::Value.md)> | Start variables for the new instance, addressed by the process as `flow_input.<name>` and as process variables. | [optional]
**business_key** | Option<**String**> | Optional business key linking the instance to a case, as on `POST /bpmn/run/p/{path}`. | [optional]
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