curl --request POST \
  --url https://api.merchantops.ai/api/products/{product_key}/variants/confirm-matrix \
  --header 'Content-Type: application/json' \
  --data '
{
  "variants": [
    {}
  ],
  "product_type_key": "<string>"
}
'

{
  "created": 123,
  "errors": [
    {}
  ]
}