Nested Custom Attributes.md

PUT /variants/12345

{ 
  "variant": {
    "attributes": [
      {
        "id":           "1234567", // Update attribute value
        "name":         "Moxy"
      },
      {
        "attribute_id": "1235",   // Add new attribute value
        "name":         "Red Sox"
      }
    ]
  }
}