Error "API is not enabled for this Organization or Partner" occurs during Marketo - Salesforce integration.
This is a Salesforce generated error and indicates that API access is not available in your SFDC instance. For more information, see this Salesforce documentation: http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_calls_concepts_core_data_objects.htm .
To resolve this, contact Salesforce to enable API access.
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