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  Universal Product Data API
  https://api.producthub.io/v1

  Endpoints:
    GET /v1/health
    GET /v1/products
    GET /v1/products/:id
    GET /v1/lookup?upc=...
    GET /v1/brands
    GET /v1/brands/:id
    GET /v1/categories
    GET /v1/categories/:id