Mock sample: HubSpot API

[waldekmastykarz]

Description

Create a mock sample for the HubSpot CRM/Marketing API.

Why

• Popular CRM and marketing platform, especially with startups
• Complex object relationships and associations
• Webhook and workflow testing
• Enables integration development without HubSpot account

Suggested endpoints to mock

• Contacts (CRUD, search)
• Companies
• Deals
• Engagements (emails, calls, meetings)
• Webhooks
• OAuth flow responses