Hi @asullivan78,
Definitely - You can use any API (GraphQL, Webhooks, SOAP) to update the process data of a request at any time.
Method UpdateProcessInstance using the SOAP WS:
Method updateRequestDataSet using GraphQL:
You can find an example using that method in this article:
Method updateRequestDataSet using Webhooks:
https://docs.advantys.com/workflowgen-integration-guide/incoming-webhooks#update-request-dataset
Regards,
Eddy.