API to update the contacts in contact list as a bulk

Is ther API to update the contacts in a contact list through bulk updates

Yes, see Upload Contact Lists

Hope this is to upload the contact list.But i need to update the existing contact list in bulk

Hi, you can use Post /contacts end point to update contacts in bulk.. You have to specify contact ids in this API.

Or, when you import csv file with existing contacts by providing contact-id-name form field as mentioned in "File Import" section in Upload Contact lists doc that Tim included in his comment, it will locate the contact(s) with contactId in contact-id-name column and update(aka replace) the contact(s).

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