curl --request POST \
  --url https://{cluster}.voucherify.io/v1/products/bulk/async \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>' \
  --data '[
  {
    "source_id": "first_product",
    "name": "Samsung Phone 1",
    "price": 220000,
    "attributes": [
      "color",
      "memory",
      "processor"
    ],
    "metadata": {
      "test": true,
      "vendor": "Online Store - 3"
    },
    "image_url": "{{internalVoucherifyURL}}"
  },
  {
    "source_id": "second_product",
    "name": "Samsung Phone 2",
    "price": 230000,
    "attributes": [
      "color",
      "memory",
      "processor"
    ],
    "metadata": {
      "test": true,
      "vendor": "Online Store - 4"
    },
    "image_url": "{{internalVoucherifyURL}}"
  }
]'

{
  "async_action_id": "aa_0a875d56c805df6601"
}