MadelineProto/docs/API_docs/methods/channels_checkUsername.md

title	description
channels.checkUsername	Check if this username is free and can be assigned to a channel/supergroup

Method: channels.checkUsername

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Check if this username is free and can be assigned to a channel/supergroup

Parameters:

Name	Type	Required	Description
channel	Username, chat ID, Update, Message or InputChannel	Optional	The channel/supergroup
username	CLICK ME string	Yes	The new username for this channel/supergroup

Return type: Bool

Can bots use this method: NO

Errors this method can return:

Error	Description
CHANNEL_INVALID	The provided channel is invalid
CHAT_ID_INVALID	The provided chat id is invalid
USERNAME_INVALID	The provided username is not valid

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();

$Bool = $MadelineProto->channels->checkUsername(['channel' => InputChannel, 'username' => 'string', ]);

PWRTelegram HTTP API example (NOT FOR MadelineProto):

As a user:

POST/GET to https://api.pwrtelegram.xyz/userTOKEN/channels.checkUsername

Parameters:

channel - Json encoded InputChannel

username - Json encoded string

Or, if you're into Lua:

Bool = channels.checkUsername({channel=InputChannel, username='string', })