ApiContactImport
Bulk creates, or bulk updates, contacts with merge options. The ID of returned object can be used to query import progress.
This API works on both contact data fields and marketing preferences. Import format can either be CSV or Excel. Must include one column called "Email". Passing a valid "mergeOption" parameter is compulsory. Any other columns will attempt to map to your custom data fields.
post/v2/contacts/import/with-merge-option/{mergeOption}
Path parameters
mergeOption'Overwrite' | 'OnlyOverwriteIfNotEmpty' | 'OnlyOverwriteIfContactDataNotPopulated' | 'NotAvailableInThisVersion' required