MadelineProtoDocs/old_docs/API_docs_v45/methods/initConnection.md

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---
title: initConnection
description: Initializes connection and save information on the user's device and application.
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image: https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png
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---
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# Method: initConnection
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[Back to methods index](index.md)
Initializes connection and save information on the user's device and application.
### Parameters:
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| Name | Type | Description | Required |
|----------|---------------|-------------|----------|
|api\_id|[int](../types/int.md) | Application identifier | Yes|
|device\_model|[string](../types/string.md) | Device model | Yes|
|system\_version|[string](../types/string.md) | System version | Yes|
|app\_version|[string](../types/string.md) | App version | Yes|
|lang\_code|[string](../types/string.md) | Language code to set | Yes|
|query|[!X](../types/!X.md) | Nested query | Yes|
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### Return type: [X](../types/X.md)
### Can bots use this method: **YES**
### MadelineProto Example:
```
if (!file_exists('madeline.php')) {
copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
}
include 'madeline.php';
$MadelineProto = new \danog\MadelineProto\API('session.madeline');
$MadelineProto->start();
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$X = $MadelineProto->initConnection(['api_id' => int, 'device_model' => 'string', 'system_version' => 'string', 'app_version' => 'string', 'lang_code' => 'string', 'query' => !X, ]);
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```
### [PWRTelegram HTTP API](https://pwrtelegram.xyz) example (NOT FOR MadelineProto):
### As a bot:
POST/GET to `https://api.pwrtelegram.xyz/botTOKEN/madeline`
Parameters:
* method - initConnection
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* params - `{"api_id": int, "device_model": "string", "system_version": "string", "app_version": "string", "lang_code": "string", "query": !X, }`
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### As a user:
POST/GET to `https://api.pwrtelegram.xyz/userTOKEN/initConnection`
Parameters:
api_id - Json encoded int
device_model - Json encoded string
system_version - Json encoded string
app_version - Json encoded string
lang_code - Json encoded string
query - Json encoded !X
Or, if you're into Lua:
```
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X = initConnection({api_id=int, device_model='string', system_version='string', app_version='string', lang_code='string', query=!X, })
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```
### Errors this method can return:
| Error | Description |
|----------|---------------|
|CONNECTION_LAYER_INVALID|Layer invalid|
|INPUT_FETCH_FAIL|Failed deserializing TL payload|