API V3 - How to set contact custom fields on add/sync api calls

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Fetch all custom fields related to Contact Id

Hi, you have to use this endpoint “https://youraccountname.api-us1.com/api/3/contacts/{contactId}/fieldValues” If you want to know how to browse easily the contacts information, you should read the “Links” and “Sideloading” paragraphs of the documentation. You can find them in this section https://developers.activecampaign.com/reference#schema