curl --request POST \
  --url https://ywe3crmpll.execute-api.us-east-2.amazonaws.com/stage/items \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "name": "",
  "default_taxable": "",
  "default_description": "",
  "type": "",
  "sku": "",
  "default_unit_price": "",
  "default_unit_cost": "",
  "default_quantity": "",
  "track_inventory": "",
  "is_active": "",
  "xero_sales_account": "",
  "xero_tax_account": "",
  "tax_rate": "",
  "vendor_id": "",
  "vendor_type": "",
  "vendor_name": "",
  "supplier_item_id": "",
  "is_automatic_replenishment_by_purchase_order_enabled": "",
  "auto_reorder_level": "",
  "replenishment_level": "",
  "minimum_order_quantity": "",
  "price_update_method": "",
  "automatic_markup_percentage": "",
  "inventory_mode": "",
  "qbo_sales_tax_code_id": "",
  "qbo_purchase_tax_code_id": "",
  "qbo_income_account_id": "",
  "qbo_expense_account_id": "",
  "qbo_asset_account_id": "",
  "qbo_id": "",
  "quantity_available": "",
  "unit_measure": "",
  "external_id": "",
  "external_type": "",
  "external_sync_status": "",
  "upc": "",
  "unit_cost_per_unit_measure": "",
  "unit_price_per_unit_measure": "",
  "minimum_dimensional_size": "",
  "maximum_dimensional_size": "",
  "is_round_up_to_even_dimensional_size": "",
  "is_labor_item": "",
  "inventory_hub_items": [
    {
      "inventory_hub_id": "",
      "is_automatic_replenishment_by_purchase_order_enabled": "",
      "auto_reorder_level": "",
      "replenishment_level": "",
      "quantity_available": ""
    },
    {
      "inventory_hub_id": "",
      "is_automatic_replenishment_by_purchase_order_enabled": "",
      "auto_reorder_level": "",
      "replenishment_level": "",
      "quantity_available": ""
    }
  ],
  "item_links": [
    {
      "item_id": "",
      "name": "",
      "url": ""
    },
    {
      "item_id": "",
      "name": "",
      "url": ""
    }
  ],
  "serialized_inventories": [
    {
      "serial_number": "",
      "reference_number": "",
      "asset_template_id": "",
      "invoice_id": "",
      "hub_id": "",
      "id_number": "",
      "default_unit_cost": ""
    },
    {
      "serial_number": "",
      "reference_number": "",
      "asset_template_id": "",
      "invoice_id": "",
      "hub_id": "",
      "id_number": "",
      "default_unit_cost": ""
    }
  ],
  "item_price_tiers": [
    {
      "tier_id": "",
      "adjustment_property": "",
      "adjustment_value": ""
    },
    {
      "tier_id": "",
      "adjustment_property": "",
      "adjustment_value": ""
    }
  ],
  "customfields": [
    {
      "id": "",
      "field_instance_id": "",
      "value": ""
    },
    {
      "id": "",
      "field_instance_id": "",
      "value": ""
    }
  ],
  "tags": ""
}
'

import requests

url = "https://ywe3crmpll.execute-api.us-east-2.amazonaws.com/stage/items"

payload = {
    "name": "",
    "default_taxable": "",
    "default_description": "",
    "type": "",
    "sku": "",
    "default_unit_price": "",
    "default_unit_cost": "",
    "default_quantity": "",
    "track_inventory": "",
    "is_active": "",
    "xero_sales_account": "",
    "xero_tax_account": "",
    "tax_rate": "",
    "vendor_id": "",
    "vendor_type": "",
    "vendor_name": "",
    "supplier_item_id": "",
    "is_automatic_replenishment_by_purchase_order_enabled": "",
    "auto_reorder_level": "",
    "replenishment_level": "",
    "minimum_order_quantity": "",
    "price_update_method": "",
    "automatic_markup_percentage": "",
    "inventory_mode": "",
    "qbo_sales_tax_code_id": "",
    "qbo_purchase_tax_code_id": "",
    "qbo_income_account_id": "",
    "qbo_expense_account_id": "",
    "qbo_asset_account_id": "",
    "qbo_id": "",
    "quantity_available": "",
    "unit_measure": "",
    "external_id": "",
    "external_type": "",
    "external_sync_status": "",
    "upc": "",
    "unit_cost_per_unit_measure": "",
    "unit_price_per_unit_measure": "",
    "minimum_dimensional_size": "",
    "maximum_dimensional_size": "",
    "is_round_up_to_even_dimensional_size": "",
    "is_labor_item": "",
    "inventory_hub_items": [
        {
            "inventory_hub_id": "",
            "is_automatic_replenishment_by_purchase_order_enabled": "",
            "auto_reorder_level": "",
            "replenishment_level": "",
            "quantity_available": ""
        },
        {
            "inventory_hub_id": "",
            "is_automatic_replenishment_by_purchase_order_enabled": "",
            "auto_reorder_level": "",
            "replenishment_level": "",
            "quantity_available": ""
        }
    ],
    "item_links": [
        {
            "item_id": "",
            "name": "",
            "url": ""
        },
        {
            "item_id": "",
            "name": "",
            "url": ""
        }
    ],
    "serialized_inventories": [
        {
            "serial_number": "",
            "reference_number": "",
            "asset_template_id": "",
            "invoice_id": "",
            "hub_id": "",
            "id_number": "",
            "default_unit_cost": ""
        },
        {
            "serial_number": "",
            "reference_number": "",
            "asset_template_id": "",
            "invoice_id": "",
            "hub_id": "",
            "id_number": "",
            "default_unit_cost": ""
        }
    ],
    "item_price_tiers": [
        {
            "tier_id": "",
            "adjustment_property": "",
            "adjustment_value": ""
        },
        {
            "tier_id": "",
            "adjustment_property": "",
            "adjustment_value": ""
        }
    ],
    "customfields": [
        {
            "id": "",
            "field_instance_id": "",
            "value": ""
        },
        {
            "id": "",
            "field_instance_id": "",
            "value": ""
        }
    ],
    "tags": ""
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: '',
    default_taxable: '',
    default_description: '',
    type: '',
    sku: '',
    default_unit_price: '',
    default_unit_cost: '',
    default_quantity: '',
    track_inventory: '',
    is_active: '',
    xero_sales_account: '',
    xero_tax_account: '',
    tax_rate: '',
    vendor_id: '',
    vendor_type: '',
    vendor_name: '',
    supplier_item_id: '',
    is_automatic_replenishment_by_purchase_order_enabled: '',
    auto_reorder_level: '',
    replenishment_level: '',
    minimum_order_quantity: '',
    price_update_method: '',
    automatic_markup_percentage: '',
    inventory_mode: '',
    qbo_sales_tax_code_id: '',
    qbo_purchase_tax_code_id: '',
    qbo_income_account_id: '',
    qbo_expense_account_id: '',
    qbo_asset_account_id: '',
    qbo_id: '',
    quantity_available: '',
    unit_measure: '',
    external_id: '',
    external_type: '',
    external_sync_status: '',
    upc: '',
    unit_cost_per_unit_measure: '',
    unit_price_per_unit_measure: '',
    minimum_dimensional_size: '',
    maximum_dimensional_size: '',
    is_round_up_to_even_dimensional_size: '',
    is_labor_item: '',
    inventory_hub_items: [
      {
        inventory_hub_id: '',
        is_automatic_replenishment_by_purchase_order_enabled: '',
        auto_reorder_level: '',
        replenishment_level: '',
        quantity_available: ''
      },
      {
        inventory_hub_id: '',
        is_automatic_replenishment_by_purchase_order_enabled: '',
        auto_reorder_level: '',
        replenishment_level: '',
        quantity_available: ''
      }
    ],
    item_links: [{item_id: '', name: '', url: ''}, {item_id: '', name: '', url: ''}],
    serialized_inventories: [
      {
        serial_number: '',
        reference_number: '',
        asset_template_id: '',
        invoice_id: '',
        hub_id: '',
        id_number: '',
        default_unit_cost: ''
      },
      {
        serial_number: '',
        reference_number: '',
        asset_template_id: '',
        invoice_id: '',
        hub_id: '',
        id_number: '',
        default_unit_cost: ''
      }
    ],
    item_price_tiers: [
      {tier_id: '', adjustment_property: '', adjustment_value: ''},
      {tier_id: '', adjustment_property: '', adjustment_value: ''}
    ],
    customfields: [
      {id: '', field_instance_id: '', value: ''},
      {id: '', field_instance_id: '', value: ''}
    ],
    tags: ''
  })
};

fetch('https://ywe3crmpll.execute-api.us-east-2.amazonaws.com/stage/items', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));