> For the complete documentation index, see [llms.txt](https://docs.tronsave.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tronsave.io/developers/code-examples/extend-with-api-key.md).

# v2 — Extend with API Key

This is a complete, runnable example for extending an existing order on TronSave using an **API Key**. It calls the v2 extend endpoints in two steps: first it estimates which delegates are extendable and how much TRX it will cost, then it submits the extend request and returns an `orderId`.

## Prerequisites

You need a TronSave API Key tied to an Internal Account. There are two ways to obtain one:

* **Option 1:** Generate the API Key on the TronSave website.
* **Option 2:** Generate the API Key on Telegram.

See [Authentication](/developers/authentication.md) for both methods and details on how the API Key authorizes requests against your Internal Account.

{% hint style="info" %}
The JavaScript example below uses only the built-in `fetch` API and does not require TronWeb. The original source noted a TronWeb 5.3.2 requirement for related examples; install it only if your wider integration needs signing:

```bash
npm i tronweb@5.3.2 @noble/secp256k1@1.7.1
```

Read more in the [TronWeb 5.3.2 release notes](https://tronweb.network/docu/docs/5.3.2/Release%20Note/).
{% endhint %}

## How it works

The flow uses two endpoints:

1. [`/v2/get-extendable-delegates`](/developers/api-reference/extend-orders/get-extendable-delegates.md) — returns the `extendData` payload, the estimated TRX cost, and whether the extension is possible.
2. [`/v2/extend-request`](/developers/api-reference/extend-orders/extend-request.md) — submits the `extendData` and returns an `orderId`.

Set these variables before running:

| Variable           | Description                                                                  |
| ------------------ | ---------------------------------------------------------------------------- |
| `API_KEY`          | Your TronSave API Key.                                                       |
| `RECEIVER`         | The address that receives the resource delegate.                             |
| `RESOURCE_TYPE`    | `ENERGY` or `BANDWIDTH`. Optional; defaults to `ENERGY`.                     |
| `extendTo`         | The time, in seconds (Unix timestamp), you want to extend the delegation to. |
| `maxPriceAccepted` | Optional. The maximum price (in SUN) you are willing to pay to extend.       |

## Full example

{% tabs %}
{% tab title="JavaScript" %}

```javascript
const API_KEY = `your-api-key`;
const TRONSAVE_API_URL = "https://api.tronsave.io"
const RECEIVER = "your-receiver-address"
const RESOURCE_TYPE = "ENERGY"

const GetEstimateExtendData = async (extendTo, maxPriceAccepted) => {
    const url = TRONSAVE_API_URL + `/v2/get-extendable-delegates`
    const body = {
        extendTo, //time in seconds you want to extend to
        receiver: RECEIVER,   //the address that receives the resource delegate
        maxPriceAccepted, //Optional. Number the maximum price you want to pay to extend
        resourceType: RESOURCE_TYPE, //ENERGY or BANDWIDTH. optional. The default is ENERGY
    }
    const data = await fetch(url, {
        method: "POST",
        headers: {
            'apikey': API_KEY,
            "content-type": "application/json",
        },
        body: JSON.stringify(body)
    })
    const response = await data.json()
    /**
     * Example response 
     * @link  
       {
            "error": false,
            "message": "Success",
            "data": {
                "extendOrderBook": [
                    {
                        "price": 784,
                        "value": 1002
                    }
                ],
                "totalDelegateAmount": 5003,
                "totalAvailableExtendAmount": 5003,
                "totalEstimateTrx": 4085783,
                "isAbleToExtend": true,
                "yourBalance": 2377366851,
                "extendData": [
                    {
                        "delegator": "TGGVrYaT8Xoos...6dmSZkohGGcouYL4",
                        "isExtend": true,
                        "extraAmount": 0,
                        "extendTo": 1745833276
                    },
                    {
                        "delegator": "TQBV7xU489Rq8Z...zBhJMdrDr51wA2",
                        "isExtend": true,
                        "extraAmount": 0,
                        "extendTo": 1745833276
                    },
                    {
                        "delegator": "TSHZv6xsYHMRCbdVh...qNozxaPPjDR6",
                        "isExtend": true,
                        "extraAmount": 0,
                        "extendTo": 1745833276
                    }
                ]
            }
        }
     */
    return response
}

/**
 * @param {number} extendTo the time in seconds you want to extend to
 * @param {boolean} maxPriceAccepted number maximum price you want to pay to extend
 * @returns 
 */
const SendExtendRequest = async (extendTo, maxPriceAccepted) => {
    const url = TRONSAVE_API_URL + `/v2/extend-request`
    // Get estimate extendable delegates
    const estimateResponse = await GetEstimateExtendData(extendTo, maxPriceAccepted)
    const extendData = estimateResponse.data?.extendData
    if (extendData && extendData.length) { 
        const body = {
            extendData: extendData,
            receiver: RECEIVER,
        }
        const data = await fetch(url, {
            method: "POST",
            headers: {
                'apikey': API_KEY,
                "content-type": "application/json",
            },
            body: JSON.stringify(body)
        })
        const response = await data.json()
        /**
         * Example response 
         {
            error: false,
            message: 'Success',
            data: { orderId: '680b5ac7b09a385fb3d582ff' }
            }
         */
        return response
    }
    return []
}

//Example run code
const ClientCode = async () => { 
    const extendTo = Math.floor(new Date().getTime() / 1000) + 3 * 86400 //Extend to 3 next days
    const maxPriceAccepted = 900
    const response = await SendExtendRequest(extendTo, maxPriceAccepted)
    console.log(response)
}


ClientCode()
```

{% endtab %}

{% tab title="PHP" %}

```php
//<?php

// Configuration
const API_KEY = 'your-api-key';
const TRONSAVE_API_URL = "https://api.tronsave.io";
const RECEIVER = "your-receiver-address";
const RESOURCE_TYPE = "ENERGY";

/**
 * Get estimate extend data
 * @param int $extendTo
 * @param int $maxPriceAccepted
 * @return array
 */
function getEstimateExtendData(int $extendTo, int $maxPriceAccepted): array {
    $url = TRONSAVE_API_URL . "/v2/get-extendable-delegates";
    $body = [
        'extendTo' => $extendTo,
        'receiver' => RECEIVER,
        'maxPriceAccepted' => $maxPriceAccepted,
        'resourceType' => RESOURCE_TYPE,
    ];

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($body));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'apikey: ' . API_KEY,
        'Content-Type: application/json'
    ]);
    $response = curl_exec($ch);
    curl_close($ch);
    return json_decode($response, true);
}

/**
 * Send extend request
 * @param int $extendTo
 * @param int $maxPriceAccepted
 * @return array
 */
function sendExtendRequest(int $extendTo, int $maxPriceAccepted): array {
    $url = TRONSAVE_API_URL . "/v2/extend-request";
    $estimateResponse = getEstimateExtendData($extendTo, $maxPriceAccepted);
    $extendData = $estimateResponse['data']['extendData'] ?? [];

    if (!empty($extendData)) {
        $body = [
            'extendData' => $extendData,
            'receiver' => RECEIVER,
        ];

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($body));
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'apikey: ' . API_KEY,
            'Content-Type: application/json'
        ]);
        $response = curl_exec($ch);
        curl_close($ch);
        return json_decode($response, true);
    }

    return [];
}

// Example run code
try {
    $extendTo = time() + (3 * 86400); // Extend to 3 next days
    $maxPriceAccepted = 900;
    $response = sendExtendRequest($extendTo, $maxPriceAccepted);
    print_r($response);
} catch (Exception $e) {
    echo "Error: " . $e->getMessage() . "\n";
} 
```

{% endtab %}

{% tab title="Python" %}

```python
import time
import requests
from typing import Dict, Any, Optional

# Configuration
API_KEY = 'your-api-key'
TRONSAVE_API_URL = "https://api.tronsave.io"
RECEIVER = "your-receiver-address"
RESOURCE_TYPE = "ENERGY"

def get_estimate_extend_data(extend_to: int, max_price_accepted: int) -> Dict[str, Any]:
    """Get estimate extend data"""
    url = f"{TRONSAVE_API_URL}/v2/get-extendable-delegates"
    headers = {
        'apikey': API_KEY,
        'Content-Type': 'application/json'
    }
    
    body = {
        'extendTo': extend_to,
        'receiver': RECEIVER,
        'maxPriceAccepted': max_price_accepted,
        'resourceType': RESOURCE_TYPE,
    }
    
    response = requests.post(url, headers=headers, json=body)
    return response.json()

def send_extend_request(extend_to: int, max_price_accepted: int) -> Dict[str, Any]:
    """Send extend request"""
    url = f"{TRONSAVE_API_URL}/v2/extend-request"
    headers = {
        'apikey': API_KEY,
        'Content-Type': 'application/json'
    }
    
    estimate_response = get_estimate_extend_data(extend_to, max_price_accepted)
    extend_data = estimate_response.get('data', {}).get('extendData', [])

    if extend_data:
        body = {
            'extendData': extend_data,
            'receiver': RECEIVER,
        }
        
        response = requests.post(url, headers=headers, json=body)
        return response.json()

    return {}

def main() -> None:
    """Main function"""
    try:
        extend_to = int(time.time()) + (3 * 86400)  # Extend to 3 next days
        max_price_accepted = 900
        response = send_extend_request(extend_to, max_price_accepted)
        print("Response:", response)
    except Exception as e:
        print(f"Error: {str(e)}")

if __name__ == "__main__":
    main() 
```

{% endtab %}
{% endtabs %}

## Next steps

* [Get Extendable Delegates](/developers/api-reference/extend-orders/get-extendable-delegates.md) — full reference for step 1.
* [Submit Extend Request](/developers/api-reference/extend-orders/extend-request.md) — full reference for step 2.
* [Authentication](/developers/authentication.md) — how to obtain and use an API Key.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.tronsave.io/developers/code-examples/extend-with-api-key.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.