REST Admin API for GET Orders not having update_by user field.

I am working on an integration of Shopify with CRM tool. I want to see if there is any way to find the user or app that modified a record (sales order, customer, product). We are trying to read order data through REST Admin API, GET order. We are using MuleSoft as integrator. And it is a bi-directional sync. We do not want to bring back the records that were just modified by the MuleSoft application. For that we need one identifier in response of GET Order API through which we can identify whether it was updated by REST API (via MuleSoft) or from Portal, so that we can filter out the update done through portal and sync with CRM tool.

Thanks for the help.