PreCheckoutQuery

For finalization, you can put your code for final check. This step is crucial in the process of the payment; before the ClientEvent.SuccesfulPayment, a ClientEvent.PreCheckoutQuery is received.

Client.on(ClientEvent.PreCheckoutQuery, ( precheckout ) => {
 
    precheckout.ok()
    // OR
    precheckout.notOk('The bot is currently not accepting orders.')

})