Fetch a single product by ext:/UUID reference

{  "object": "product",  "id": "string",  "product_number": "string",  "name": "string",  "account_number": -9007199254740991,  "unit": "string",  "default_price": 0,  "quantity": 0,  "comments": "string",  "external_id": "string",  "external_reference": "string"}