Source
List ownership, import & exit — found from sitemap — Constant Contact
Checked for Constant Contact on 26 Oct 2026
- Page
- https://v3.developer.constantcontact.com/api_guide/bulk-activity-endpoints/bulk-activities-import-contacts
- Checked
- 26 Oct 2026, 16:15 UTC
- How we may use it
- Public page, crawling permitted
Technical details
- type
- page
- http status
- 200
- content hash
- sha256:7d76c8014ee782d246bb45ddcf7c036517129707265079b994088c58b860e88e
- permission
- robots_ok
- screenshot
- Screenshot on file (internal exhibit, not published)
Cited by
Facts read from this source
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Import endpoints Report an error
“You can import new contacts from another source into a Constant Contact account by making a POST call using either a CSV payload (/activities/contacts_file_import ) or a JSON payload (/activities/contacts_json_import).”
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Import contact identifier Report an error
“Contacts must have either an email address or an SMS number defined. These endpoints use the email addresses or SMS number you provide in the import to determine if each contact is new or not.”
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Import update behavior Report an error
“Importing an existing contact only updates the contact properties you include in the import request.”
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Import size limit Report an error
“File size: The size of the imported CSV file or JSON payload must be less than 4 megabytes (MB).”
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Import row limit Report an error
“Number of contacts: The total number of rows in the CSV import file cannot exceed 40,000 (39,999 contact rows plus a headings row). The total number of contacts in the JSON payload cannot exceed 40,000.”
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CSV required content type Report an error
“This method requires a multipart/form-data request body that requires including the file and list_ids properties. The content-type MUST be unspecified when using this endpoint.”
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CSV list ids limit Report an error
“list_ids - The contact lists you want to add all imported contacts to as an array of contact list_id values. You must include at least one list_id value and cannot include more than 50 list_id values.”
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CSV sms permission param Report an error
“sms_permission_to_send - Use to set SMS permissions at the file level for all contacts with SMS numbers. Set to explicit to specify that all contacts provided explicit permission. If explicit, you must also include the sms_consent_date as a column header to specify the date the contact consented to receiving SMS messages. Set to not_set to specify that contacts have not yet provided consent.”
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CSV required headers Report an error
“The CSV file must contain either an email or sms_number header.”
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Import custom fields limit Report an error
“You can add up to 25 different custom field headings for each contact.”
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Custom fields preexist required Report an error
“In order to import custom field data, the custom fields must already exist in the Constant Contact account you are using.”
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Json list ids limit Report an error
“list_ids - Required. The contact lists you want to add all imported contacts to as an array of contact list_id strings. You must include at least one list_id value and cannot include more than 50 list_id values.”
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Import default permission Report an error
“permission_to_send applies to the email address and is set to Implicit by default for all new contacts created in an import activity. permission_to_send is not changed for any existing contacts included in an import activity.”
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Json endpoint requirements Report an error
“User privileges: contacts:write Authorization scopes: contact_data”
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Status check endpoint Report an error
“Send a GET request to the /activities/{activity_id} endpoint endpoint to determine when the V3 API has finished importing your contacts.”
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Sms number format Report an error
“sms_number string, Max. Length:16 The US phone number to associate with the contact's SMS-enabled phone. Valid formats are 1231231234 or 123-123-1234. Requires a valid country code.”
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API base URL Report an error
“https://api.cc.email/v3/activities/contacts_json_import”
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Import permission compliance Report an error
“Permission to send signifies the type of relationship an account owner has with a contact. It is important for compliance with US and international anti-spam law.”
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