Create HubSpot product records and associate them with line items on a quote

Steps

1. Create a product in the HubSpot product library: POST https://api.hubapi.com/crm/v3/objects/products with properties including 'name', 'price', and optionally 'description' and 'hs_sku'.
2. Retrieve the product ID from the response.
3. When creating a line item for a quote, include 'hs_product_id': '{productId}' in the line item properties; this associates the line item to the product record and may auto-populate fields like name and price from the product.
4. Create the line item: POST https://api.hubapi.com/crm/v3/objects/line_items with the required properties and hs_product_id.
5. Associate the line item to the relevant quote using the Associations API v4: POST https://api.hubapi.com/crm/v4/objects/line_items/{lineItemId}/associations/default/quotes/{quoteId}.
6. To update a product's price globally, PATCH https://api.hubapi.com/crm/v3/objects/products/{productId} — note this does not retroactively update existing line items.