Synching blank values from Salesforce to Marketo - overwriting existing data
We are synching some data from Salesforce to Marketo using a custom integration through API calls.
we have a phone extension field on our User table in SFDC. If we add a value to this field, or change the value in this field, the data synchs to Marketo via a syncmultipleleads api call just fine. However, if we blank out an existing value in SFDC, the field remains unchanged in Marketo.
is there a specific method that is recommended to pass along a blank value from SDFC that overwrites a populated value in Marketo?