Keep Gladly customers in sync with new HubSpot contacts

Whenever a new contact is created in HubSpot, keep our Gladly support system in sync by upserting that person as a Gladly customer. Trigger this on HubSpot's new-contact poll trigger so it runs automatically each time a contact is added in the CRM.

From the new HubSpot contact, read the email, first name, last name, and phone number. If the contact has no email address, stop and skip it. Email is the natural key for this sync because Gladly customer emails are unique per organization, and a contact with no email cannot be matched safely.

Look the person up in Gladly with Find Customers, searching by the contact's email. Because Gladly customer emails are unique across the org, at most one profile will match.

If no matching Gladly customer exists, create one with Create Customer, setting the customer name from the HubSpot first and last name, the email from the HubSpot email, and the phone from the HubSpot phone. If a matching customer already exists, update it with Update Customer so its name, email, and phone match the HubSpot contact.

Map the fields deterministically: combine HubSpot's first name and last name into the Gladly customer name, put the HubSpot email into the customer's email, and put the HubSpot phone into the customer's phone. This is a one-way sync from HubSpot into Gladly: only create or update, never delete a Gladly customer, and do not run this in reverse. Gladly REST reference: https://developer.gladly.com/rest/