Create, update, and merge Freshdesk contacts and link them to companies via the Freshdesk API

Steps

1. Authenticate with your Freshdesk API key as the HTTP Basic Auth username and any string (e.g. "X") as the password, e.g. curl -u {api_key}:X, over HTTPS at https://{domain}.freshdesk.com/api/v2/
2. Create a contact with POST /api/v2/contacts, supplying name plus at least one of email or phone; set company_id (or other_companies) to associate the contact with a company
3. Create a company with POST /api/v2/companies, supplying name and an optional domains array — contacts whose email domain matches an entry in domains are auto-associated with that company
4. Read or update records with GET/PUT /api/v2/contacts/[id] and GET/PUT /api/v2/companies/[id]; use /api/v2/contacts/autocomplete?term= or the beta /api/v2/search/contacts?query= for filtered lookups (companies have equivalent autocomplete/search endpoints)
5. Merge duplicate contacts with POST /api/v2/contacts/merge, designating a primary contact that retains name/phone/company details and absorbs the secondary contact's tickets and notes
6. For bulk retrieval, trigger an asynchronous export via /api/v2/contacts/export or /api/v2/companies/export and poll the returned job for a CSV download URL