Map the buying committee in HubSpot when a Stripe customer signs up

Build me an agent workflow that turns every new paying Stripe customer into a buying-committee expansion play in HubSpot so my AE can multi-thread the account from day one.

Trigger: a Stripe webhook on the customer.subscription.created event. When it fires, retrieve the related Stripe customer to get their email and name. Pull the domain off the email. If the domain is a personal email provider (gmail.com, yahoo.com, outlook.com, hotmail.com, icloud.com, aol.com, proton.me, etc.), stop. We only run this for real company domains.

Step 1 (Hunter): call Search Emails by Domain on the company domain. Filter the results to decision-maker seniority (executive, director, manager) AND a revenue-adjacent department (executive, sales, marketing, IT, finance, operations). Drop anything that looks like a generic role inbox (info@, sales@, support@, hello@, contact@, billing@, admin@, hr@), and drop any result whose email matches the original Stripe purchaser. Aim for the strongest 5 to 8 candidates. Reason about who is actually worth adding — prefer titles that imply real budget or buying influence (VP, Head of, Director, Chief, Senior Manager) over individual contributors.

Step 2 (Hunter): for the candidate list, call Enrich Company by Domain once on the customer's domain to grab industry, description, headquarters, and tech stack. Then call Enrich Person by Email on each candidate to confirm their title and pick up LinkedIn handles. If a candidate's enrichment comes back empty or contradicts what Domain Search returned, drop them.

Step 3 (HubSpot): use Search Companies to check whether a company already exists for that domain. If not, Create Company with the name, domain, industry, description, and headquarters from Hunter's company enrichment. Hold onto the HubSpot company ID either way.

Step 4 (HubSpot): Batch Upsert Contacts for the qualified decision-makers using email as the unique key. For each contact set first name, last name, email, job title, LinkedIn URL, department, seniority, and a custom property (or lifecycle stage) tagging them as a Stripe customer expansion target. Associate each contact to the HubSpot company from Step 3. Batch Upsert dedupes by email, so re-firing on the same account is safe.

Step 5 (HubSpot): Create Note on the company summarizing the buying committee you just mapped. Keep it short: who paid (the original Stripe purchaser), what company enrichment found (industry, size, headline tech), the list of decision-makers you added with titles and departments, and a one-line suggested multi-thread plan for the AE (who to reach first and why). Associate the note to the company.

Guardrails: cap new contacts at 8 per account. Never add the original purchaser as a 'new' contact. Skip personal email domains. Don't invent titles or departments — only use values that came back from Hunter enrichment. If Hunter returns zero qualified candidates after filtering, still create or update the company in HubSpot and leave a note saying no additional decision-makers were found so the AE knows to research manually.