curl --request POST \
  --url https://api.vambe.me/api/public/apps/{appId}/events/checkout \
  --header 'Content-Type: application/json' \
  --header 'x-vambe-signature: <x-vambe-signature>' \
  --header 'x-vambe-timestamp: <x-vambe-timestamp>' \
  --data '
{
  "checkout": {
    "external_id": "<string>",
    "external_name": "<string>",
    "currency": "<string>",
    "total_price": 1,
    "recover_url": "<string>",
    "details_url": "<string>",
    "line_items": [
      {
        "external_product_id": "<string>",
        "quantity": 4503599627370495
      }
    ]
  }
}
'