MadelineProtoDocs/old_docs/API_docs_v66/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**
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### MadelineProto Example ([now async for huge speed and parallelism!](https://docs.madelineproto.xyz/docs/ASYNC.html)):
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```php
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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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```
Or, if you're into Lua:
```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|