2 of 2 people found this helpful
Depends on which one you're looking for, but in the REST API, they're called sfdcLeadId, sfdcContactId, and sfdcAccountId. The best way to get field names for the APIs is by going the the Describe Lead Method: http://developers.marketo.com/documentation/rest/describe/
1 of 1 people found this helpful
You can also export all fields REST and SOAP API names in Admin -> field management -> Export field names, in 1 minute and without a developer
Thank you. sfdcleadid was the one my developer was looking for.