Hello HongliangC8,
Thank you for your reply.
The /v3/activities/{activity_id} link returned in the initial response to a Bulk Activities import request will typically show errors pertaining to a failed import in the "activity_errors" object, however, some errors pertaining to issues with specific contacts being imported may only be found on the “View Import/Export Activity” page in the Contacts section of the website UI currently.
Get the Status of a Bulk Activity:
https://developer.constantcontact.com/api_guide/activity_status.html
Please have a look and let us know if you have any other questions!
Regards,
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