Update contact
Update a v1 contact by integer ID.
overwrite query parameter controls whether custom fields are merged or replaced.Authorizations
Recommended authentication for new integrations. Generate a short-lived JWT from your API Secret ID and API Secret Key, then pass the signed JWT as a bearer token in the Authorization header.
API Secret credentials are available in the Heymarket app under Settings > Integrations > API. The Secret Key is shown only when it is generated, so copy and store it securely before closing the dialog.
Use the following JWT values:
Replace CURRENT_UNIX_TIMESTAMP with the current Unix timestamp in seconds when generating the token.
Sign the JWT with HMAC-SHA256 using this signing secret:
Send the signed JWT as a bearer token:
Tokens expire 5 minutes after the iat timestamp. Generate a new JWT per request, or cache it briefly for less than 5 minutes. Generate JWTs only from trusted server-side code; do not expose the API Secret Key in browser, mobile, or other client-side code.
Path Parameters
Contact ID
Query Parameters
Overwrite existing custom fields. Note that the contact's name is overwritten regardless of this parameter
Body
Contact json
"12345678900"
"https://some.image.url.com/img.jpg"
"John Smith"
"john.s@heymarket.com"
"John"
"Smith"
External Contact ID
External Service
IANA timezone for the contact (e.g., America/New_York)
"America/New_York"
42
true