curl --request POST \
  --url https://sandbox.tight.com/v6/invoicing/invoices/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "previewType": "INVOICE",
  "lineItems": [
    {
      "description": "Consulting services",
      "quantity": 2,
      "rate": 5000,
      "expenseId": "btxn_28868401",
      "timeId": "tme_28868401"
    }
  ],
  "invoiceNumber": "HAR-1",
  "date": "2025-07-26",
  "term": {
    "type": "NET_30",
    "dueDate": "2025-07-26"
  },
  "paymentMethods": [],
  "notes": "<string>",
  "attachments": [
    {
      "publicFileUrl": "https://example.com/files/receipt.pdf",
      "caption": "Receipt"
    }
  ],
  "installments": [
    {
      "dueDate": "2025-08-26",
      "type": "PERCENT",
      "value": 5000
    }
  ],
  "dimensionValueIds": [
    "<string>"
  ]
}
'

import requests

url = "https://sandbox.tight.com/v6/invoicing/invoices/preview"

payload = {
    "previewType": "INVOICE",
    "lineItems": [
        {
            "description": "Consulting services",
            "quantity": 2,
            "rate": 5000,
            "expenseId": "btxn_28868401",
            "timeId": "tme_28868401"
        }
    ],
    "invoiceNumber": "HAR-1",
    "date": "2025-07-26",
    "term": {
        "type": "NET_30",
        "dueDate": "2025-07-26"
    },
    "paymentMethods": [],
    "notes": "<string>",
    "attachments": [
        {
            "publicFileUrl": "https://example.com/files/receipt.pdf",
            "caption": "Receipt"
        }
    ],
    "installments": [
        {
            "dueDate": "2025-08-26",
            "type": "PERCENT",
            "value": 5000
        }
    ],
    "dimensionValueIds": ["<string>"]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    previewType: 'INVOICE',
    lineItems: [
      {
        description: 'Consulting services',
        quantity: 2,
        rate: 5000,
        expenseId: 'btxn_28868401',
        timeId: 'tme_28868401'
      }
    ],
    invoiceNumber: 'HAR-1',
    date: '2025-07-26',
    term: {type: 'NET_30', dueDate: '2025-07-26'},
    paymentMethods: [],
    notes: '<string>',
    attachments: [{publicFileUrl: 'https://example.com/files/receipt.pdf', caption: 'Receipt'}],
    installments: [{dueDate: '2025-08-26', type: 'PERCENT', value: 5000}],
    dimensionValueIds: ['<string>']
  })
};

fetch('https://sandbox.tight.com/v6/invoicing/invoices/preview', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://sandbox.tight.com/v6/invoicing/invoices/preview",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'previewType' => 'INVOICE',
    'lineItems' => [
        [
                'description' => 'Consulting services',
                'quantity' => 2,
                'rate' => 5000,
                'expenseId' => 'btxn_28868401',
                'timeId' => 'tme_28868401'
        ]
    ],
    'invoiceNumber' => 'HAR-1',
    'date' => '2025-07-26',
    'term' => [
        'type' => 'NET_30',
        'dueDate' => '2025-07-26'
    ],
    'paymentMethods' => [
        
    ],
    'notes' => '<string>',
    'attachments' => [
        [
                'publicFileUrl' => 'https://example.com/files/receipt.pdf',
                'caption' => 'Receipt'
        ]
    ],
    'installments' => [
        [
                'dueDate' => '2025-08-26',
                'type' => 'PERCENT',
                'value' => 5000
        ]
    ],
    'dimensionValueIds' => [
        '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://sandbox.tight.com/v6/invoicing/invoices/preview"

	payload := strings.NewReader("{\n  \"previewType\": \"INVOICE\",\n  \"lineItems\": [\n    {\n      \"description\": \"Consulting services\",\n      \"quantity\": 2,\n      \"rate\": 5000,\n      \"expenseId\": \"btxn_28868401\",\n      \"timeId\": \"tme_28868401\"\n    }\n  ],\n  \"invoiceNumber\": \"HAR-1\",\n  \"date\": \"2025-07-26\",\n  \"term\": {\n    \"type\": \"NET_30\",\n    \"dueDate\": \"2025-07-26\"\n  },\n  \"paymentMethods\": [],\n  \"notes\": \"<string>\",\n  \"attachments\": [\n    {\n      \"publicFileUrl\": \"https://example.com/files/receipt.pdf\",\n      \"caption\": \"Receipt\"\n    }\n  ],\n  \"installments\": [\n    {\n      \"dueDate\": \"2025-08-26\",\n      \"type\": \"PERCENT\",\n      \"value\": 5000\n    }\n  ],\n  \"dimensionValueIds\": [\n    \"<string>\"\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://sandbox.tight.com/v6/invoicing/invoices/preview")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"previewType\": \"INVOICE\",\n  \"lineItems\": [\n    {\n      \"description\": \"Consulting services\",\n      \"quantity\": 2,\n      \"rate\": 5000,\n      \"expenseId\": \"btxn_28868401\",\n      \"timeId\": \"tme_28868401\"\n    }\n  ],\n  \"invoiceNumber\": \"HAR-1\",\n  \"date\": \"2025-07-26\",\n  \"term\": {\n    \"type\": \"NET_30\",\n    \"dueDate\": \"2025-07-26\"\n  },\n  \"paymentMethods\": [],\n  \"notes\": \"<string>\",\n  \"attachments\": [\n    {\n      \"publicFileUrl\": \"https://example.com/files/receipt.pdf\",\n      \"caption\": \"Receipt\"\n    }\n  ],\n  \"installments\": [\n    {\n      \"dueDate\": \"2025-08-26\",\n      \"type\": \"PERCENT\",\n      \"value\": 5000\n    }\n  ],\n  \"dimensionValueIds\": [\n    \"<string>\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.tight.com/v6/invoicing/invoices/preview")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"previewType\": \"INVOICE\",\n  \"lineItems\": [\n    {\n      \"description\": \"Consulting services\",\n      \"quantity\": 2,\n      \"rate\": 5000,\n      \"expenseId\": \"btxn_28868401\",\n      \"timeId\": \"tme_28868401\"\n    }\n  ],\n  \"invoiceNumber\": \"HAR-1\",\n  \"date\": \"2025-07-26\",\n  \"term\": {\n    \"type\": \"NET_30\",\n    \"dueDate\": \"2025-07-26\"\n  },\n  \"paymentMethods\": [],\n  \"notes\": \"<string>\",\n  \"attachments\": [\n    {\n      \"publicFileUrl\": \"https://example.com/files/receipt.pdf\",\n      \"caption\": \"Receipt\"\n    }\n  ],\n  \"installments\": [\n    {\n      \"dueDate\": \"2025-08-26\",\n      \"type\": \"PERCENT\",\n      \"value\": 5000\n    }\n  ],\n  \"dimensionValueIds\": [\n    \"<string>\"\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "result": "SUCCESS",
  "data": "<string>"
}

{
  "result": "FAILURE",
  "error": [
    {
      "type": "REQUIRED",
      "message": "Amount is required",
      "param": "amount"
    }
  ]
}

{
  "result": "FAILURE",
  "error": [
    {
      "type": "INVALID_TOKEN",
      "message": "Invalid access token"
    }
  ]
}

{
  "result": "FAILURE",
  "error": [
    {
      "type": "FORBIDDEN",
      "message": "Expired access token"
    }
  ]
}

{
  "result": "FAILURE",
  "error": [
    {
      "type": "BAD_REQUEST",
      "message": "Resource not found"
    }
  ]
}

{
  "result": "FAILURE",
  "error": [
    {
      "type": "UNKNOWN_ERROR",
      "message": "Something went wrong. Please try again later."
    }
  ]
}