How do I send data to Appian, to start a process model from third party applicat

you can use a servlet plugin to do so. In that case data from third party application will be sent through that plugin to your process model. In your process model you should declare variables as parameter (who are required to start your process).

you can use a servlet plugin to do so. In that case data from third party application will be sent through that plugin to your process model. In your process model you should declare variables as parameter (who are required to start your process).