Retrieves a single contact by id.
AuthorizationRequiredBearer <token>API key as Bearer token
In: header
idRequiredstringContact id, discoverable via list_contacts
Bulk Upsert Contacts
Upserts up to many contacts in one round-trip, deduplicated server-side by email. Partial-safe: scalar fieldsupdate only when supplied, and custom properties merge by property_id (supplied properties are added/overwritten, omitted ones are preserved). Never wipes properties you do not resend.
Update Contact
Updates a contact. Optionally merges another contact into the target when `mergeWith` is set.