Create a product

Example request

{
  "external_id": "my_product_123",
  "name": "Saint Germain Product",
  "description": "Description",
  "brand": "Louis Vutton",
  "price": 1,
  "sku": "8120725247",
  "img_url": "https://test.com/image.png",
  "category": "Category",
  "custom_fields": [
    {
      "name": "foo",
      "value": "bar"
    },
    {
      "name": "foo2",
      "value": "bar2"
    }
  ]
}