I am trying to set data source priorities. Like Salesforce being 1 and then webhooks to append data be below that.
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There's no such concept in Marketo.
The only way to deprioritize webhook-based updates to existing data is to (a) pass the updates through an intermediate webhook that can compare current data to potential new data, and (b) keep a running log (in your own textarea field) of the last source of a given field.