Method: messages.setBotPrecheckoutResults

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Once the user has confirmed their payment and shipping details, the bot receives an updateBotPrecheckoutQuery update.
Use this method to respond to such pre-checkout queries.
Note: Telegram must receive an answer within 10 seconds after the pre-checkout query was sent.

Parameters:

Name	Type	Description	Required
success	Bool	Set this flag if everything is alright (goods are available, etc.) and the bot is ready to proceed with the order, otherwise do not set it, and set the `error` field, instead	Optional
query_id	long	Unique identifier for the query to be answered	Yes
error	string	Required if the `success` isn’t set. Error message in human readable form that explains the reason for failure to proceed with the checkout (e.g. “Sorry, somebody just bought the last of our amazing black T-shirts while you were busy filling out your payment details. Please choose a different color or garment!”). Telegram will display this message to the user.	Optional

Return type: Bool

Can bots use this method: YES

MadelineProto Example (now async for huge speed and parallelism!):

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->messages->setBotPrecheckoutResults(success: $Bool, query_id: $long, error: 'string', );