curl --request POST \
  --url https://api.example.com/v1/ucc/field_mapping \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "list": [
    {
      "ucc_fields_api": "<string>",
      "ucc_fields_label": "<string>",
      "default_label": "<string>",
      "include_in_export": true,
      "sort_order": 123
    }
  ],
  "mappings": [
    {
      "ucc_fields_api": "<string>",
      "ucc_fields_label": "<string>",
      "default_label": "<string>",
      "include_in_export": true,
      "sort_order": 123
    }
  ],
  "field_mappings": [
    {
      "ucc_fields_api": "<string>",
      "ucc_fields_label": "<string>",
      "default_label": "<string>",
      "include_in_export": true,
      "sort_order": 123
    }
  ]
}
'

{
  "success": true,
  "list": [
    {
      "ucc_fields_api": "<string>",
      "ucc_fields_label": "<string>",
      "default_label": "<string>",
      "include_in_export": true,
      "sort_order": 123
    }
  ],
  "length": 123
}