curl -X POST 'http://localhost:9000/vendor/products' \
  -H 'Authorization: Bearer <token>' \
  -H 'x-seller-id: <seller_id>' \
  -H 'Content-Type: application/json' \
  -d '{
    "title": "Acme T-Shirt",
    "options": [{ "title": "Size", "values": ["S", "M"] }],
    "variants": [
      { "title": "S", "sku": "ACME-SHIRT-S", "options": { "Size": "S" } },
      { "title": "M", "sku": "ACME-SHIRT-M", "options": { "Size": "M" } }
    ]
  }'

const { product } = await client.vendor.products.mutate({
  title: "Acme T-Shirt",
  options: [{ title: "Size", values: ["S", "M"] }],
  variants: [
    { title: "S", sku: "ACME-SHIRT-S", options: { Size: "S" } },
    { title: "M", sku: "ACME-SHIRT-M", options: { Size: "M" } },
  ],
})

{
  "product": {
    "id": "prod_01HXYZ",
    "title": "Acme T-Shirt",
    "status": "proposed",
    "handle": "acme-t-shirt",
    "variants": [
      { "id": "variant_01HXYZ", "title": "M", "sku": "ACME-SHIRT-M" }
    ]
  }
}